constant-expression-cxx11.cpp revision daaefc5381f9aafbb1cb6f88fb5ac6aaf34d65bf
1c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith// RUN: %clang_cc1 -triple i686-linux -fsyntax-only -verify -std=c++11 -pedantic %s -Wno-comment 259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace StaticAssertFoldTest { 459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithint x; 69eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(++x, "test"); // expected-error {{not an integral constant expression}} 79eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(false, "test"); // expected-error {{test}} 859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 1059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: support const T& parameters here. 1259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith//template<typename T> constexpr T id(const T &t) { return t; } 13c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithtemplate<typename T> constexpr T id(T t) { return t; } // expected-note {{here}} 1459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: support templates here. 1559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith//template<typename T> constexpr T min(const T &a, const T &b) { 1659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// return a < b ? a : b; 1759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith//} 1859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith//template<typename T> constexpr T max(const T &a, const T &b) { 1959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// return a < b ? b : a; 2059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith//} 2159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int min(const int &a, const int &b) { return a < b ? a : b; } 2259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int max(const int &a, const int &b) { return a < b ? b : a; } 2359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct MemberZero { 2559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int zero() { return 0; } 2659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 2759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace DerivedToVBaseCast { 2959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct U { int n; }; 3159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct V : U { int n; }; 3259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct A : virtual V { int n; }; 3359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct Aa { int n; }; 3459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct B : virtual A, Aa {}; 3559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct C : virtual A, Aa {}; 3659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct D : B, C {}; 3759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith D d; 3959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr B *p = &d; 4059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr C *q = &d; 419eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((void*)p != (void*)q, ""); 429eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((A*)p == (A*)q, ""); 439eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((Aa*)p != (Aa*)q, ""); 4459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 4559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr B &pp = d; 4659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr C &qq = d; 479eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((void*)&pp != (void*)&qq, ""); 489eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(A&)pp == &(A&)qq, ""); 499eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(Aa&)pp != &(Aa&)qq, ""); 5059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 5159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr V *v = p; 5259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr V *w = q; 5359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr V *x = (A*)p; 549eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(v == w, ""); 559eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(v == x, ""); 5659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 579eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((U*)&d == p, ""); 589eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((U*)&d == q, ""); 599eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((U*)&d == v, ""); 609eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((U*)&d == w, ""); 619eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((U*)&d == x, ""); 6259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 6359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct X {}; 6459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct Y1 : virtual X {}; 6559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct Y2 : X {}; 6659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct Z : Y1, Y2 {}; 6759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Z z; 689eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((X*)(Y1*)&z != (X*)(Y2*)&z, ""); 6959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 7059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 7159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 72f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithnamespace ConstCast { 73f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith 74f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int n1 = 0; 75f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int n2 = const_cast<int&>(n1); 76f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int *n3 = const_cast<int*>(&n1); 77f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int n4 = *const_cast<int*>(&n1); 78f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr const int * const *n5 = const_cast<const int* const*>(&n3); 79f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int **n6 = const_cast<int**>(&n3); 80f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int n7 = **n5; 81f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smithconstexpr int n8 = **n6; 82f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith 83f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith} 84f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith 8559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace TemplateArgumentConversion { 8659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith template<int n> struct IntParam {}; 8759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 8859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith using IntParam0 = IntParam<0>; 89e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: This should be accepted once we implement the new ICE rules. 9059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith using IntParam0 = IntParam<id(0)>; // expected-error {{not an integral constant expression}} 9159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith using IntParam0 = IntParam<MemberZero().zero>; // expected-error {{did you mean to call it with no arguments?}} expected-error {{not an integral constant expression}} 9259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 9359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 9459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace CaseStatements { 9559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith void f(int n) { 9659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (n) { 9759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // FIXME: Produce the 'add ()' fixit for this. 98c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith case MemberZero().zero: // desired-error {{did you mean to call it with no arguments?}} expected-error {{not an integer constant expression}} expected-note {{non-literal type '<bound member function type>'}} 99e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: This should be accepted once we implement the new ICE rules. 100c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith case id(1): // expected-error {{not an integer constant expression}} expected-note {{undefined function}} 10159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return; 10259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 10359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 10459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 10559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 10659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithextern int &Recurse1; 10759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithint &Recurse2 = Recurse1, &Recurse1 = Recurse2; 10859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int &Recurse3 = Recurse2; // expected-error {{must be initialized by a constant expression}} 10959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 11059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace MemberEnum { 11159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct WithMemberEnum { 11259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith enum E { A = 42 }; 11359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } wme; 11459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1159eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(wme.A == 42, ""); 11659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 11759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 11859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace DefaultArguments { 11959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 12059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconst int z = int(); 12159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int Sum(int a = 0, const int &b = 0, const int *c = &z, char d = 0) { 12259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return a + b + *c + d; 12359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 12459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconst int four = 4; 12559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int eight = 8; 12659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const int twentyseven = 27; 1279eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(Sum() == 0, ""); 1289eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(Sum(1) == 1, ""); 1299eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(Sum(1, four) == 5, ""); 1309eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(Sum(1, eight, &twentyseven) == 36, ""); 1319eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(Sum(1, 2, &four, eight) == 15, ""); 13259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 13359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 13459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 13559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Ellipsis { 13659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 13759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// Note, values passed through an ellipsis can't actually be used. 13859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int F(int a, ...) { return a; } 1399eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(F(0) == 0, ""); 1409eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(F(1, 0) == 1, ""); 1419eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(F(2, "test") == 2, ""); 1429eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(F(3, &F) == 3, ""); 14359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithint k = 0; 144daaefc5381f9aafbb1cb6f88fb5ac6aaf34d65bfRichard Smithstatic_assert(F(4, k) == 3, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 14559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 14659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 14759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 14859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Recursion { 14959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int fib(int n) { return n > 1 ? fib(n-1) + fib(n-2) : n; } 1509eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(fib(11) == 89, ""); 15159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 15259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int gcd_inner(int a, int b) { 15359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return b == 0 ? a : gcd_inner(b, a % b); 15459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 15559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int gcd(int a, int b) { 15659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return gcd_inner(max(a, b), min(a, b)); 15759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 15859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1599eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(gcd(1749237, 5628959) == 7, ""); 16059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 16159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 16259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace FunctionCast { 16359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // When folding, we allow functions to be cast to different types. Such 16459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // cast functions cannot be called, even if they're constexpr. 16559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int f() { return 1; } 16659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith typedef double (*DoubleFn)(); 16759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith typedef int (*IntFn)(); 168c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int a[(int)DoubleFn(f)()]; // expected-error {{variable length array}} expected-warning{{extension}} 16959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int b[(int)IntFn(f)()]; // ok 17059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 17159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 17259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace StaticMemberFunction { 17359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct S { 17459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static constexpr int k = 42; 17559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith static constexpr int f(int n) { return n * k + 2; } 17659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } s; 17759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 17859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int n = s.f(19); 1799eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(S::f(19) == 800, ""); 1809eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(s.f(19) == 800, ""); 1819eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(n == 800, ""); 1821bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 1831bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith constexpr int (*sf1)(int) = &S::f; 1841bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith constexpr int (*sf2)(int) = &s.f; 1851bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith constexpr const int *sk = &s.k; 18659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 18759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 18859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace ParameterScopes { 18959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 19059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const int k = 42; 19159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr const int &ObscureTheTruth(const int &a) { return a; } 19259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr const int &MaybeReturnJunk(bool b, const int a) { 19359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return ObscureTheTruth(b ? a : k); 19459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 1959eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(MaybeReturnJunk(false, 0) == 42, ""); // ok 19659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int a = MaybeReturnJunk(true, 0); // expected-error {{constant expression}} 19759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 19859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr const int MaybeReturnNonstaticRef(bool b, const int a) { 19959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // If ObscureTheTruth returns a reference to 'a', the result is not a 20059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // constant expression even though 'a' is still in scope. 20159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return ObscureTheTruth(b ? a : k); 20259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2039eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(MaybeReturnNonstaticRef(false, 0) == 42, ""); // ok 20459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int b = MaybeReturnNonstaticRef(true, 0); // expected-error {{constant expression}} 20559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 20659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int InternalReturnJunk(int n) { 20759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // FIXME: We should reject this: it never produces a constant expression. 20859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return MaybeReturnJunk(true, n); 20959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 21059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int n3 = InternalReturnJunk(0); // expected-error {{must be initialized by a constant expression}} 21159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 21259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int LToR(int &n) { return n; } 21359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int GrabCallersArgument(bool which, int a, int b) { 21459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return LToR(which ? b : a); 21559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2169eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(GrabCallersArgument(false, 1, 2) == 1, ""); 2179eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(GrabCallersArgument(true, 4, 8) == 8, ""); 21859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 21959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 22059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 22159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Pointers { 22259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 22359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int f(int n, const int *a, const int *b, const int *c) { 22459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return n == 0 ? 0 : *a + f(n-1, b, c, a); 22559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 22659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 22759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const int x = 1, y = 10, z = 100; 2289eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(f(23, &x, &y, &z) == 788, ""); 22959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 23059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int g(int n, int a, int b, int c) { 23159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return f(n, &a, &b, &c); 23259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2339eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(g(23, x, y, z) == 788, ""); 23459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 23559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 23659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 23759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace FunctionPointers { 23859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 23959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Double(int n) { return 2 * n; } 24059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Triple(int n) { return 3 * n; } 24159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Twice(int (*F)(int), int n) { return F(F(n)); } 24259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Quadruple(int n) { return Twice(Double, n); } 24359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr auto Select(int n) -> int (*)(int) { 24459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return n == 2 ? &Double : n == 3 ? &Triple : n == 4 ? &Quadruple : 0; 24559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 24659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Apply(int (*F)(int), int n) { return F(n); } 24759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2489eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(1 + Apply(Select(4), 5) + Apply(Select(3), 7) == 42, ""); 24959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 25059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int Invalid = Apply(Select(0), 0); // expected-error {{must be initialized by a constant expression}} 25159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 25259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 25359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 25459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace PointerComparison { 25559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 25659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithint x, y; 2579eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x == &y, "false"); // expected-error {{false}} 2589eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x != &y, ""); 25959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g1 = &x == &y; 26059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g2 = &x != &y; 26159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g3 = &x <= &y; // expected-error {{must be initialized by a constant expression}} 26259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g4 = &x >= &y; // expected-error {{must be initialized by a constant expression}} 26359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g5 = &x < &y; // expected-error {{must be initialized by a constant expression}} 26459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool g6 = &x > &y; // expected-error {{must be initialized by a constant expression}} 26559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 26659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct S { int x, y; } s; 2679eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&s.x == &s.y, "false"); // expected-error {{false}} 2689eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&s.x != &s.y, ""); 2699eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&s.x <= &s.y, ""); 2709eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&s.x >= &s.y, "false"); // expected-error {{false}} 2719eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&s.x < &s.y, ""); 2729eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&s.x > &s.y, "false"); // expected-error {{false}} 2739eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith 2749eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(0 == &y, "false"); // expected-error {{false}} 2759eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(0 != &y, ""); 27659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n3 = 0 <= &y; // expected-error {{must be initialized by a constant expression}} 27759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n4 = 0 >= &y; // expected-error {{must be initialized by a constant expression}} 27859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n5 = 0 < &y; // expected-error {{must be initialized by a constant expression}} 27959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n6 = 0 > &y; // expected-error {{must be initialized by a constant expression}} 28059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2819eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x == 0, "false"); // expected-error {{false}} 2829eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x != 0, ""); 28359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n9 = &x <= 0; // expected-error {{must be initialized by a constant expression}} 28459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n10 = &x >= 0; // expected-error {{must be initialized by a constant expression}} 28559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n11 = &x < 0; // expected-error {{must be initialized by a constant expression}} 28659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool n12 = &x > 0; // expected-error {{must be initialized by a constant expression}} 28759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2889eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x == &x, ""); 2899eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x != &x, "false"); // expected-error {{false}} 2909eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x <= &x, ""); 2919eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x >= &x, ""); 2929eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x < &x, "false"); // expected-error {{false}} 2939eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&x > &x, "false"); // expected-error {{false}} 29459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 29559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr S* sptr = &s; 29659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: This is not a constant expression; check we reject this and move this 29759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// test elsewhere. 29859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool dyncast = sptr == dynamic_cast<S*>(sptr); 29959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 300c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smithstruct Str { 301c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // FIXME: In C++ mode, we should say 'integral' not 'integer' 302c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int a : dynamic_cast<S*>(sptr) == dynamic_cast<S*>(sptr); // \ 303c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith expected-warning {{not integer constant expression}} \ 3044cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith expected-note {{dynamic_cast is not allowed in a constant expression}} 305c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int b : reinterpret_cast<S*>(sptr) == reinterpret_cast<S*>(sptr); // \ 306c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith expected-warning {{not integer constant expression}} \ 3074cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith expected-note {{reinterpret_cast is not allowed in a constant expression}} 308c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int c : (S*)(long)(sptr) == (S*)(long)(sptr); // \ 309c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith expected-warning {{not integer constant expression}} \ 31060f24e781484250d3602261477d16321db7a157bRichard Smith expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 311c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int d : (S*)(42) == (S*)(42); // \ 312c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith expected-warning {{not integer constant expression}} \ 31360f24e781484250d3602261477d16321db7a157bRichard Smith expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 314c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int e : (Str*)(sptr) == (Str*)(sptr); // \ 315c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith expected-warning {{not integer constant expression}} \ 31660f24e781484250d3602261477d16321db7a157bRichard Smith expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 317c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int f : &(Str&)(*sptr) == &(Str&)(*sptr); // \ 318c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith expected-warning {{not integer constant expression}} \ 31960f24e781484250d3602261477d16321db7a157bRichard Smith expected-note {{cast which performs the conversions of a reinterpret_cast is not allowed in a constant expression}} 320c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith int g : (S*)(void*)(sptr) == sptr; // \ 321c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith expected-warning {{not integer constant expression}} \ 3224cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith expected-note {{cast from 'void *' is not allowed in a constant expression}} 323c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith}; 324c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 32559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithextern char externalvar[]; 32659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: This is not a constant expression; check we reject this and move this 32759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// test elsewhere. 3289eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithconstexpr bool constaddress = (void *)externalvar == (void *)0x4000UL; // expected-error {{must be initialized by a constant expression}} 32959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool litaddress = "foo" == "foo"; // expected-error {{must be initialized by a constant expression}} expected-warning {{unspecified}} 3309eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(0 != "foo", ""); 33159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 33259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 33359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 33459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace MaterializeTemporary { 33559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 33659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int f(const int &r) { return r; } 33759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int n = f(1); 33859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 33959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool same(const int &a, const int &b) { return &a == &b; } 34059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool sameTemporary(const int &n) { return same(n, n); } 34159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3429eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(n, ""); 3439eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(!same(4, 4), ""); 3449eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(same(n, n), ""); 3459eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(sameTemporary(9), ""); 34659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 34759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 34859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 34959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int strcmp_ce(const char *p, const char *q) { 35059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return (!*p || *p != *q) ? *p - *q : strcmp_ce(p+1, q+1); 35159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 35259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 35359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace StringLiteral { 35459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 35559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: Refactor this once we support constexpr templates. 35659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int MangleChars(const char *p) { 35759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return *p + 3 * (*p ? MangleChars(p+1) : 0); 35859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 35959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int MangleChars(const char16_t *p) { 36059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return *p + 3 * (*p ? MangleChars(p+1) : 0); 36159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 36259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int MangleChars(const char32_t *p) { 36359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return *p + 3 * (*p ? MangleChars(p+1) : 0); 36459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 36559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3669eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(MangleChars("constexpr!") == 1768383, ""); 3679eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(MangleChars(u"constexpr!") == 1768383, ""); 3689eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(MangleChars(U"constexpr!") == 1768383, ""); 36959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 37059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr char c0 = "nought index"[0]; 37159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr char c1 = "nice index"[10]; 372a5aa96d01f2f8750a4756ca74c8e172384a54602Matt Beaumont-Gayconstexpr char c2 = "nasty index"[12]; // expected-error {{must be initialized by a constant expression}} expected-warning {{is past the end}} 373a5aa96d01f2f8750a4756ca74c8e172384a54602Matt Beaumont-Gayconstexpr char c3 = "negative index"[-1]; // expected-error {{must be initialized by a constant expression}} expected-warning {{is before the beginning}} 37459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr char c4 = ((char*)(int*)"no reinterpret_casts allowed")[14]; // expected-error {{must be initialized by a constant expression}} 37559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 37659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *p = "test" + 2; 3779eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(*p == 's', ""); 37859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 37959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *max_iter(const char *a, const char *b) { 38059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return *a < *b ? b : a; 38159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 38259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *max_element(const char *a, const char *b) { 38359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return (a+1 >= b) ? a : max_iter(a, max_element(a+1, b)); 38459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 38559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 38659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *begin(const char (&arr)[45]) { return arr; } 38759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *end(const char (&arr)[45]) { return arr + 45; } 38859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 38959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr char str[] = "the quick brown fox jumped over the lazy dog"; 39059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const char *max = max_element(begin(str), end(str)); 3919eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(*max == 'z', ""); 3929eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(max == str + 38, ""); 39359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3949eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(strcmp_ce("hello world", "hello world") == 0, ""); 3959eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(strcmp_ce("hello world", "hello clang") > 0, ""); 3969eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(strcmp_ce("constexpr", "test") < 0, ""); 3979eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(strcmp_ce("", " ") < 0, ""); 39859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 39959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 40059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 40159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Array { 40259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 40359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: Use templates for these once we support constexpr templates. 40459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int Sum(const int *begin, const int *end) { 40559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return begin == end ? 0 : *begin + Sum(begin+1, end); 40659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 40759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const int *begin(const int (&xs)[5]) { return xs; } 40859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const int *end(const int (&xs)[5]) { return xs + 5; } 40959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 41059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int xs[] = { 1, 2, 3, 4, 5 }; 41159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int ys[] = { 5, 4, 3, 2, 1 }; 41259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int sum_xs = Sum(begin(xs), end(xs)); 4139eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(sum_xs == 15, ""); 41459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 41559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int ZipFoldR(int (*F)(int x, int y, int c), int n, 41659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const int *xs, const int *ys, int c) { 417daaefc5381f9aafbb1cb6f88fb5ac6aaf34d65bfRichard Smith return n ? F( 418daaefc5381f9aafbb1cb6f88fb5ac6aaf34d65bfRichard Smith *xs, // expected-note {{subexpression not valid}} 419daaefc5381f9aafbb1cb6f88fb5ac6aaf34d65bfRichard Smith *ys, ZipFoldR(F, n-1, xs+1, ys+1, c)) : c; 42059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 42159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int MulAdd(int x, int y, int c) { return x * y + c; } 42259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int InnerProduct = ZipFoldR(MulAdd, 5, xs, ys, 0); 4239eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(InnerProduct == 35, ""); 42459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 42559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int SubMul(int x, int y, int c) { return (x - y) * c; } 42659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int DiffProd = ZipFoldR(SubMul, 2, xs+3, ys+3, 1); 4279eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(DiffProd == 8, ""); 4289eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(ZipFoldR(SubMul, 3, xs+3, ys+3, 1), ""); // expected-error {{constant expression}} 42959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 43059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const int *p = xs + 3; 43159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int xs4 = p[1]; // ok 43259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int xs5 = p[2]; // expected-error {{constant expression}} 43359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int xs0 = p[-3]; // ok 43459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int xs_1 = p[-4]; // expected-error {{constant expression}} 43559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 43659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int zs[2][2][2][2] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; 4379eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(zs[0][0][0][0] == 1, ""); 4389eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(zs[1][1][1][1] == 16, ""); 439daaefc5381f9aafbb1cb6f88fb5ac6aaf34d65bfRichard Smithstatic_assert(zs[0][0][0][2] == 3, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 4409eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((&zs[0][0][0][2])[-1] == 2, ""); 4419eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(**(**(zs + 1) + 1) == 11, ""); 4429eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(*(&(&(*(*&(&zs[2] - 1)[0] + 2 - 2))[2])[-1][-1] + 1) == 11, ""); 44359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 444c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smithconstexpr int arr[40] = { 1, 2, 3, [8] = 4 }; // expected-warning {{extension}} 44559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int SumNonzero(const int *p) { 44659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return *p + (*p ? SumNonzero(p+1) : 0); 44759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 44859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int CountZero(const int *p, const int *q) { 44959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return p == q ? 0 : (*p == 0) + CountZero(p+1, q); 45059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 4519eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(SumNonzero(arr) == 6, ""); 4529eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(CountZero(arr, arr + 40) == 36, ""); 45359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 454e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstruct ArrayElem { 455e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr ArrayElem() : n(0) {} 456e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int n; 457e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int f() { return n; } 458e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 459e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstruct ArrayRVal { 460e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr ArrayRVal() {} 461e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayElem elems[10]; 462e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 4639eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(ArrayRVal().elems[3].f() == 0, ""); 464e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 46559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 46659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 46759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace DependentValues { 46859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 46959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct I { int n; typedef I V[10]; }; 47059efe266b804330f4c1f3a1b0ff783e67dd90378Richard SmithI::V x, y; 47159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithtemplate<bool B> struct S { 47259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int k; 47359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith void f() { 47459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith I::V &cells = B ? x : y; 47559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith I &i = cells[k]; 47659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (i.n) {} 47759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 47859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 47959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 48059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 48159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 48259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Class { 48359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 48459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct A { constexpr A(int a, int b) : k(a + b) {} int k; }; 48559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int fn(const A &a) { return a.k; } 4869eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(fn(A(4,5)) == 9, ""); 48759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 48859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct B { int n; int m; } constexpr b = { 0, b.n }; // expected-warning {{uninitialized}} 48959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct C { 49059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr C(C *this_) : m(42), n(this_->m) {} // ok 49159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int m, n; 49259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 49359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct D { 49459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith C c; 49559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr D() : c(&c) {} 49659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 4979eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(D().c.n == 42, ""); 49859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 49959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct E { 50059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr E() : p(&p) {} 50159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith void *p; 50259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 50359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr const E &e1 = E(); // expected-error {{constant expression}} 50459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// This is a constant expression if we elide the copy constructor call, and 50559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// is not a constant expression if we don't! But we do, so it is. 50659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: The move constructor is not currently implicitly defined as constexpr. 50759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// We notice this when evaluating an expression which uses it, but not when 50859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// checking its initializer. 50959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr E e2 = E(); // unexpected-error {{constant expression}} 510daaefc5381f9aafbb1cb6f88fb5ac6aaf34d65bfRichard Smithstatic_assert(e2.p == &e2.p, ""); // unexpected-error {{constant expression}} unexpected-note {{subexpression}} 51159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// FIXME: We don't pass through the fact that 'this' is ::e3 when checking the 51259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith// initializer of this declaration. 51359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr E e3; // unexpected-error {{constant expression}} 5149eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(e3.p == &e3.p, ""); 51559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 51659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithextern const class F f; 51759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct F { 51859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr F() : p(&f.p) {} 51959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const void *p; 52059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 52159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr F f = F(); 52259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 52359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct G { 52459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith struct T { 52559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr T(T *p) : u1(), u2(p) {} 52659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith union U1 { 52759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr U1() {} 52859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a, b = 42; 52959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } u1; 53059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith union U2 { 53159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr U2(T *p) : c(p->u1.b) {} 53259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int c, d; 53359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } u2; 53459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } t; 53559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr G() : t(&t) {} 53659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} constexpr g; 53759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 538daaefc5381f9aafbb1cb6f88fb5ac6aaf34d65bfRichard Smithstatic_assert(g.t.u1.a == 42, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 5399eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(g.t.u1.b == 42, ""); 5409eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(g.t.u2.c == 42, ""); 541daaefc5381f9aafbb1cb6f88fb5ac6aaf34d65bfRichard Smithstatic_assert(g.t.u2.d == 42, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 54259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 54359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct S { 54459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a, b; 54559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const S *p; 54659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith double d; 54759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const char *q; 54859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 54959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr S(int n, const S *p) : a(5), b(n), p(p), d(n), q("hello") {} 55059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 55159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 55259efe266b804330f4c1f3a1b0ff783e67dd90378Richard SmithS global(43, &global); 55359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 5549eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(S(15, &global).b == 15, ""); 55559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 55659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool CheckS(const S &s) { 55759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return s.a == 5 && s.b == 27 && s.p == &global && s.d == 27. && s.q[3] == 'l'; 55859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 5599eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(CheckS(S(27, &global)), ""); 56059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 56159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct Arr { 56259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith char arr[3]; 56359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr Arr() : arr{'x', 'y', 'z'} {} 56459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 56559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int hash(Arr &&a) { 56659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return a.arr[0] + a.arr[1] * 0x100 + a.arr[2] * 0x10000; 56759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 56859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr int k = hash(Arr()); 5699eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(k == 0x007a7978, ""); 57059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 57159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 57259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct AggregateInit { 57359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const char &c; 57459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int n; 57559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith double d; 57659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int arr[5]; 57759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith void *p; 57859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 57959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 58059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr AggregateInit agg1 = { "hello"[0] }; 58159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 5829eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(strcmp_ce(&agg1.c, "hello") == 0, ""); 5839eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(agg1.n == 0, ""); 5849eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(agg1.d == 0.0, ""); 585daaefc5381f9aafbb1cb6f88fb5ac6aaf34d65bfRichard Smithstatic_assert(agg1.arr[-1] == 0, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 5869eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(agg1.arr[0] == 0, ""); 5879eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(agg1.arr[4] == 0, ""); 588daaefc5381f9aafbb1cb6f88fb5ac6aaf34d65bfRichard Smithstatic_assert(agg1.arr[5] == 0, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 5899eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(agg1.p == nullptr, ""); 59059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 59159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace SimpleDerivedClass { 59259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 59359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct B { 59459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr B(int n) : a(n) {} 59559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a; 59659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 59759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct D : B { 59859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr D(int n) : B(n) {} 59959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 60059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr D d(3); 6019eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(d.a == 3, ""); 60259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 60359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 60459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 605e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstruct Bottom { constexpr Bottom() {} }; 606e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstruct Base : Bottom { 60759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr Base(int a = 42, const char *b = "test") : a(a), b(b) {} 60859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a; 60959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const char *b; 61059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 611e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstruct Base2 : Bottom { 61259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr Base2(const int &r) : r(r) {} 61359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int q = 123; 61459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // FIXME: When we track the global for which we are computing the initializer, 61559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // use a reference here. 61659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith //const int &r; 61759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int r; 61859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 61959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstruct Derived : Base, Base2 { 62059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr Derived() : Base(76), Base2(a) {} 62159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int c = r + b[1]; 62259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 62359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 62459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr bool operator==(const Base &a, const Base &b) { 62559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return a.a == b.a && strcmp_ce(a.b, b.b) == 0; 62659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 62759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 62859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr Base base; 62959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr Base base2(76); 63059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr Derived derived; 6319eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(derived.a == 76, ""); 6329eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(derived.b[2] == 's', ""); 6339eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(derived.c == 76 + 'e', ""); 6349eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(derived.q == 123, ""); 6359eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(derived.r == 76, ""); 6369eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&derived.r == &derived.a, ""); // expected-error {{}} 63759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 6389eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(!(derived == base), ""); 6399eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(derived == base2, ""); 64059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 641e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Bottom &bot1 = (Base&)derived; 642e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Bottom &bot2 = (Base2&)derived; 6439eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&bot1 != &bot2, ""); 644e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 645e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Bottom *pb1 = (Base*)&derived; 646e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Bottom *pb2 = (Base2*)&derived; 6479eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(pb1 != pb2, ""); 6489eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(pb1 == &bot1, ""); 6499eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(pb2 == &bot2, ""); 650e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 651e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Base2 &fail = (Base2&)bot1; // expected-error {{constant expression}} 652e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Base &fail2 = (Base&)*pb2; // expected-error {{constant expression}} 653e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Base2 &ok2 = (Base2&)bot2; 6549eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&ok2 == &derived, ""); 655e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 656e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Base2 *pfail = (Base2*)pb1; // expected-error {{constant expression}} 657e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Base *pfail2 = (Base*)&bot2; // expected-error {{constant expression}} 658e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Base2 *pok2 = (Base2*)pb2; 6599eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(pok2 == &derived, ""); 6609eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(&ok2 == pok2, ""); 6619eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((Base2*)(Derived*)(Base*)pb1 == pok2, ""); 6629eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((Derived*)(Base*)pb1 == (Derived*)pok2, ""); 663e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 664e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr Base *nullB = 42 - 6 * 7; 6659eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((Bottom*)nullB == 0, ""); 6669eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((Derived*)nullB == 0, ""); 6679eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((void*)(Bottom*)nullB == (void*)(Derived*)nullB, ""); 668e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 669e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 670e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 671e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace Temporaries { 672e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 673e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstruct S { 674e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr S() {} 675e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int f(); 676e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 677e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstruct T : S { 678e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr T(int n) : S(), n(n) {} 679e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int n; 680e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 681e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr int S::f() { 682e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // 'this' must be the postfix-expression in a class member access expression, 683e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // so we can't just use 684e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // return static_cast<T*>(this)->n; 685e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return this->*(int(S::*))&T::n; 686e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 687e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// The T temporary is implicitly cast to an S subobject, but we can recover the 688e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// T full-object via a base-to-derived cast, or a derived-to-base-casted member 689e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// pointer. 6909eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(T(3).f() == 3, ""); 691e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 692e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr int f(const S &s) { 693e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return static_cast<const T&>(s).n; 694e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 695e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithconstexpr int n = f(T(5)); 6969eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(f(T(5)) == 5, ""); 697e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 69859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 69959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 70059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Union { 70159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 70259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithunion U { 70359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int a; 70459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int b; 70559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 70659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 707c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smithconstexpr U u[4] = { { .a = 0 }, { .b = 1 }, { .a = 2 }, { .b = 3 } }; // expected-warning 4{{extension}} 7089eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(u[0].a == 0, ""); 7099eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(u[0].b, ""); // expected-error {{constant expression}} 7109eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(u[1].b == 1, ""); 711daaefc5381f9aafbb1cb6f88fb5ac6aaf34d65bfRichard Smithstatic_assert((&u[1].b)[1] == 2, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 712daaefc5381f9aafbb1cb6f88fb5ac6aaf34d65bfRichard Smithstatic_assert(*(&(u[1].b) + 1 + 1) == 3, ""); // expected-error {{constant expression}} expected-note {{subexpression}} 7139eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((&(u[1]) + 1 + 1)->b == 3, ""); 71459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 71559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 71659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 717e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace MemberPointer { 718e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct A { 719e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr A(int n) : n(n) {} 720e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int n; 721e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int f() { return n + 3; } 722e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 723e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr A a(7); 7249eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(A(5).*&A::n == 5, ""); 7259eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((&a)->*&A::n == 7, ""); 7269eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((A(8).*&A::f)() == 11, ""); 7279eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(((&a)->*&A::f)() == 10, ""); 728e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 729e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct B : A { 730e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr B(int n, int m) : A(n), m(m) {} 731e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int m; 732e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int g() { return n + m + 1; } 733e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 734e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr B b(9, 13); 7359eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(B(4, 11).*&A::n == 4, ""); 7369eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(B(4, 11).*&B::m == 11, ""); 7379eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(B(4, 11).*(int(A::*))&B::m == 11, ""); 7389eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((&b)->*&A::n == 9, ""); 7399eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((&b)->*&B::m == 13, ""); 7409eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((&b)->*(int(A::*))&B::m == 13, ""); 7419eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((B(4, 11).*&A::f)() == 7, ""); 7429eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((B(4, 11).*&B::g)() == 16, ""); 7439eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((B(4, 11).*(int(A::*)()const)&B::g)() == 16, ""); 7449eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(((&b)->*&A::f)() == 12, ""); 7459eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(((&b)->*&B::g)() == 23, ""); 7469eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(((&b)->*(int(A::*)()const)&B::g)() == 23, ""); 747e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 748e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct S { 749e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr S(int m, int n, int (S::*pf)() const, int S::*pn) : 750e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith m(m), n(n), pf(pf), pn(pn) {} 751e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr S() : m(), n(), pf(&S::f), pn(&S::n) {} 752e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 753e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int f() { return this->*pn; } 754e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith virtual int g() const; 755e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 756e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int m, n; 757e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int (S::*pf)() const; 758e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int S::*pn; 759e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 760e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 761e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int S::*pm = &S::m; 762e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int S::*pn = &S::n; 763e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int (S::*pf)() const = &S::f; 764e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int (S::*pg)() const = &S::g; 765e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 766e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr S s(2, 5, &S::f, &S::m); 767e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 7689eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((s.*&S::f)() == 2, ""); 7699eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((s.*s.pf)() == 2, ""); 770e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 771e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith template<int n> struct T : T<n-1> {}; 772e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith template<> struct T<0> { int n; }; 773e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith template<> struct T<30> : T<29> { int m; }; 774e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 775e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith T<17> t17; 776e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith T<30> t30; 777e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 778e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int (T<10>::*deepn) = &T<0>::n; 7799eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(t17.*deepn) == &t17.n, ""); 780e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 781e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int (T<15>::*deepm) = (int(T<10>::*))&T<30>::m; 782e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int *pbad = &(t17.*deepm); // expected-error {{constant expression}} 7839eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(t30.*deepm) == &t30.m, ""); 784e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 785e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr T<5> *p17_5 = &t17; 786e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr T<13> *p17_13 = (T<13>*)p17_5; 787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr T<23> *p17_23 = (T<23>*)p17_13; // expected-error {{constant expression}} 7889eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(p17_5->*(int(T<3>::*))deepn) == &t17.n, ""); 7899eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(p17_13->*deepn) == &t17.n, ""); 790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int *pbad2 = &(p17_13->*(int(T<9>::*))deepm); // expected-error {{constant expression}} 791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr T<5> *p30_5 = &t30; 793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr T<23> *p30_23 = (T<23>*)p30_5; 794e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr T<13> *p30_13 = p30_23; 7959eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(p30_5->*(int(T<3>::*))deepn) == &t30.n, ""); 7969eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(p30_13->*deepn) == &t30.n, ""); 7979eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(p30_23->*deepn) == &t30.n, ""); 7989eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(p30_5->*(int(T<2>::*))deepm) == &t30.m, ""); 7999eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(((T<17>*)p30_13)->*deepm) == &t30.m, ""); 8009eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(&(p30_23->*deepm) == &t30.m, ""); 801e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace ArrayBaseDerived { 804e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 805e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct Base { 806e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Base() {} 807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith int n = 0; 808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct Derived : Base { 810e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived() {} 811e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr const int *f() { return &n; } 812e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived a[10]; 815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived *pd3 = const_cast<Derived*>(&a[3]); 816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Base *pb3 = const_cast<Derived*>(&a[3]); 8179eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(pb3 == pd3, ""); 818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 819e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // pb3 does not point to an array element. 820e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Base *pb4 = pb3 + 1; // ok, one-past-the-end pointer. 821e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int pb4n = pb4->n; // expected-error {{constant expression}} 822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Base *err_pb5 = pb3 + 2; // FIXME: reject this. 823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int err_pb5n = err_pb5->n; // expected-error {{constant expression}} 824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Base *err_pb2 = pb3 - 1; // FIXME: reject this. 825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int err_pb2n = err_pb2->n; // expected-error {{constant expression}} 826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Base *pb3a = pb4 - 1; 827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // pb4 does not point to a Derived. 829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived *err_pd4 = (Derived*)pb4; // expected-error {{constant expression}} 830e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived *pd3a = (Derived*)pb3a; 831e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int pd3n = pd3a->n; 832e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 833e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // pd3a still points to the Derived array. 834e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived *pd6 = pd3a + 3; 8359eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert(pd6 == &a[6], ""); 836e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived *pd9 = pd6 + 3; 837e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Derived *pd10 = pd6 + 4; 838e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int pd9n = pd9->n; // ok 839e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int err_pd10n = pd10->n; // expected-error {{constant expression}} 840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int pd0n = pd10[-10].n; 841e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr int err_pdminus1n = pd10[-11].n; // expected-error {{constant expression}} 842e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 843e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr Base *pb9 = pd9; 844e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith constexpr const int *(Base::*pfb)() const = 845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith static_cast<const int *(Base::*)() const>(&Derived::f); 8469eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smith static_assert((pb9->*pfb)() == &a[9].n, ""); 847e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 84959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithnamespace Complex { 85059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 85159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithclass complex { 85259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith int re, im; 85359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithpublic: 85459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr complex(int re = 0, int im = 0) : re(re), im(im) {} 85559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr complex(const complex &o) : re(o.re), im(o.im) {} 85659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr complex operator-() const { return complex(-re, -im); } 85759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith friend constexpr complex operator+(const complex &l, const complex &r) { 85859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return complex(l.re + r.re, l.im + r.im); 85959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 86059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith friend constexpr complex operator-(const complex &l, const complex &r) { 86159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return l + -r; 86259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 86359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith friend constexpr complex operator*(const complex &l, const complex &r) { 86459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return complex(l.re * r.re - l.im * r.im, l.re * r.im + l.im * r.re); 86559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 86659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith friend constexpr bool operator==(const complex &l, const complex &r) { 86759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return l.re == r.re && l.im == r.im; 86859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 86959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr bool operator!=(const complex &r) const { 87059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return re != r.re || im != r.im; 87159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 87259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int real() const { return re; } 87359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr int imag() const { return im; } 87459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 87559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 87659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr complex i = complex(0, 1); 87759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr complex k = (3 + 4*i) * (6 - 4*i); 8789eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(complex(1,0).real() == 1, ""); 8799eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(complex(1,0).imag() == 0, ""); 8809eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(((complex)1).imag() == 0, ""); 8819eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(k.real() == 34, ""); 8829eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(k.imag() == 12, ""); 8839eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(k - 34 == 12*i, ""); 8849eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((complex)1 == complex(1), ""); 8859eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((complex)1 != complex(0, 1), ""); 8869eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(complex(1) == complex(1), ""); 8879eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(complex(1) != complex(0, 1), ""); 88859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr complex makeComplex(int re, int im) { return complex(re, im); } 8899eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(makeComplex(1,0) == complex(1), ""); 8909eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(makeComplex(1,0) != complex(0, 1), ""); 89159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 89259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithclass complex_wrap : public complex { 89359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithpublic: 89459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr complex_wrap(int re, int im = 0) : complex(re, im) {} 89559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith constexpr complex_wrap(const complex_wrap &o) : complex(o) {} 89659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith}; 89759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 8989eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((complex_wrap)1 == complex(1), ""); 8999eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert((complex)1 != complex_wrap(0, 1), ""); 9009eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(complex(1) == complex_wrap(1), ""); 9019eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(complex_wrap(1) != complex(0, 1), ""); 90259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithconstexpr complex_wrap makeComplexWrap(int re, int im) { 90359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return complex_wrap(re, im); 90459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 9059eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(makeComplexWrap(1,0) == complex(1), ""); 9069eed49c2bb0f37bbfefefd0998b6303a686a66c0Richard Smithstatic_assert(makeComplexWrap(1,0) != complex(0, 1), ""); 90759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 90859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 909