1// RUN: %clang_cc1 -fsyntax-only -verify %s 2// RUN: %clang_cc1 -fsyntax-only -verify %s -fdelayed-template-parsing -DDELAYED_TEMPLATE_PARSING 3// RUN: %clang_cc1 -fsyntax-only -verify -std=gnu++1z %s 4 5 6 7// Errors 8export class foo { }; // expected-error {{expected template}} 9template x; // expected-error {{C++ requires a type specifier for all declarations}} \ 10 // expected-error {{does not refer}} 11export template x; // expected-error {{expected '<' after 'template'}} 12export template<class T> class x0; // expected-warning {{exported templates are unsupported}} 13template < ; // expected-error {{expected template parameter}} \ 14// expected-error{{expected ',' or '>' in template-parameter-list}} \ 15// expected-warning {{declaration does not declare anything}} 16template <int +> struct x1; // expected-error {{expected ',' or '>' in template-parameter-list}} 17 18// verifies that we only walk to the ',' & still produce errors on the rest of the template parameters 19template <int +, T> struct x2; // expected-error {{expected ',' or '>' in template-parameter-list}} \ 20 expected-error {{expected unqualified-id}} 21template<template<int+>> struct x3; // expected-error {{expected ',' or '>' in template-parameter-list}} \ 22 expected-error {{template template parameter requires 'class' after the parameter list}} 23template <template X> struct Err1; // expected-error {{expected '<' after 'template'}} \ 24// expected-error{{extraneous}} 25template <template <typename> > struct Err2; // expected-error {{template template parameter requires 'class' after the parameter list}} 26template <template <typename> Foo> struct Err3; // expected-error {{template template parameter requires 'class' after the parameter list}} 27 28template <template <typename> typename Foo> struct Cxx1z; 29#if __cplusplus <= 201402L 30// expected-warning@-2 {{extension}} 31#endif 32 33// Template function declarations 34template <typename T> void foo(); 35template <typename T, typename U> void foo(); 36 37// Template function definitions. 38template <typename T> void foo() { } 39 40// Template class (forward) declarations 41template <typename T> struct A; 42template <typename T, typename U> struct b; 43template <typename> struct C; 44template <typename, typename> struct D; 45 46// Forward declarations with default parameters? 47template <typename T = int> class X1; 48template <typename = int> class X2; 49 50// Forward declarations w/template template parameters 51template <template <typename> class T> class TTP1; 52template <template <typename> class> class TTP2; 53template <template <typename> class T = foo> class TTP3; // expected-error{{must be a class template}} 54template <template <typename> class = foo> class TTP3; // expected-error{{must be a class template}} 55template <template <typename X, typename Y> class T> class TTP5; 56 57// Forward declarations with non-type params 58template <int> class NTP0; 59template <int N> class NTP1; 60template <int N = 5> class NTP2; 61template <int = 10> class NTP3; 62template <unsigned int N = 12u> class NTP4; 63template <unsigned int = 12u> class NTP5; 64template <unsigned = 15u> class NTP6; 65template <typename T, T Obj> class NTP7; 66 67// Template class declarations 68template <typename T> struct A { }; 69template <typename T, typename U> struct B { }; 70 71// Template parameter shadowing 72template<typename T, // expected-note{{template parameter is declared here}} 73 typename T> // expected-error{{declaration of 'T' shadows template parameter}} 74 void shadow1(); 75 76template<typename T> // expected-note{{template parameter is declared here}} 77void shadow2(int T); // expected-error{{declaration of 'T' shadows template parameter}} 78 79template<typename T> // expected-note{{template parameter is declared here}} 80class T { // expected-error{{declaration of 'T' shadows template parameter}} 81}; 82 83template<int Size> // expected-note{{template parameter is declared here}} 84void shadow3(int Size); // expected-error{{declaration of 'Size' shadows template parameter}} 85 86// <rdar://problem/6952203> 87template<typename T> // expected-note{{here}} 88struct shadow4 { 89 int T; // expected-error{{shadows}} 90}; 91 92template<typename T> // expected-note{{here}} 93struct shadow5 { 94 int T(int, float); // expected-error{{shadows}} 95}; 96 97template<typename T, // expected-note{{template parameter is declared here}} 98 T T> // expected-error{{declaration of 'T' shadows template parameter}} 99void shadow6(); 100 101template<typename T, // expected-note{{template parameter is declared here}} 102 template<typename> class T> // expected-error{{declaration of 'T' shadows template parameter}} 103void shadow7(); 104 105// PR8302 106template<template<typename> class T> struct shadow8 { // expected-note{{template parameter is declared here}} 107 template<template<typename> class T> struct inner; // expected-error{{declaration of 'T' shadows template parameter}} 108}; 109 110// Non-type template parameters in scope 111template<int Size> 112void f(int& i) { 113 i = Size; 114 #ifdef DELAYED_TEMPLATE_PARSING 115 Size = i; 116 #else 117 Size = i; // expected-error{{expression is not assignable}} 118 #endif 119} 120 121template<typename T> 122const T& min(const T&, const T&); 123 124void f2() { 125 int x; 126 A< typeof(x>1) > a; 127} 128 129 130// PR3844 131template <> struct S<int> { }; // expected-error{{explicit specialization of non-template struct 'S'}} 132template <> union U<int> { }; // expected-error{{explicit specialization of non-template union 'U'}} 133 134namespace PR6184 { 135 namespace N { 136 template <typename T> 137 void bar(typename T::x); 138 } 139 140 template <typename T> 141 void N::bar(typename T::x) { } 142} 143 144// This PR occurred only in template parsing mode. 145namespace PR17637 { 146template <int> 147struct L { 148 template <typename T> 149 struct O { 150 template <typename U> 151 static void Fun(U); 152 }; 153}; 154 155template <int k> 156template <typename T> 157template <typename U> 158void L<k>::O<T>::Fun(U) {} 159 160void Instantiate() { L<0>::O<int>::Fun(0); } 161 162} 163 164namespace explicit_partial_specializations { 165typedef char (&oneT)[1]; 166typedef char (&twoT)[2]; 167typedef char (&threeT)[3]; 168typedef char (&fourT)[4]; 169typedef char (&fiveT)[5]; 170typedef char (&sixT)[6]; 171 172char one[1]; 173char two[2]; 174char three[3]; 175char four[4]; 176char five[5]; 177char six[6]; 178 179template<bool b> struct bool_ { typedef int type; }; 180template<> struct bool_<false> { }; 181 182#define XCAT(x,y) x ## y 183#define CAT(x,y) XCAT(x,y) 184#define sassert(_b_) bool_<(_b_)>::type CAT(var, __LINE__); 185 186 187template <int> 188struct L { 189 template <typename T> 190 struct O { 191 template <typename U> 192 static oneT Fun(U); 193 194 }; 195}; 196template <int k> 197template <typename T> 198template <typename U> 199oneT L<k>::O<T>::Fun(U) { return one; } 200 201template<> 202template<> 203template<typename U> 204oneT L<0>::O<char>::Fun(U) { return one; } 205 206 207void Instantiate() { 208 sassert(sizeof(L<0>::O<int>::Fun(0)) == sizeof(one)); 209 sassert(sizeof(L<0>::O<char>::Fun(0)) == sizeof(one)); 210} 211 212} 213