class-template-spec.cpp revision 98137534e612c274ba270af99d73429043957e53
1// RUN: clang -fsyntax-only -verify %s 2template<typename T, typename U = int> struct A; // expected-note 2{{template is declared here}} 3 4template<> struct A<double, double>; // expected-note{{forward declaration}} 5 6template<> struct A<float, float> { // expected-note{{previous definition}} 7 int x; 8}; 9 10template<> struct A<float> { // expected-note{{previous definition}} 11 int y; 12}; 13 14int test_specs(A<float, float> *a1, A<float, int> *a2) { 15 return a1->x + a2->y; 16} 17 18int test_incomplete_specs(A<double, double> *a1, 19 A<double> *a2) 20{ 21 (void)a1->x; // expected-error{{incomplete definition of type 'A<double, double>'}} 22 (void)a2->x; // expected-error{{implicit instantiation of undefined template 'struct A<double, int>'}} 23} 24 25typedef float FLOAT; 26 27template<> struct A<float, FLOAT>; 28 29template<> struct A<FLOAT, float> { }; // expected-error{{redefinition}} 30 31template<> struct A<float, int> { }; // expected-error{{redefinition}} 32 33template<typename T, typename U = int> struct X; 34 35template <> struct X<int, int> { int foo(); }; // #1 36template <> struct X<float> { int bar(); }; // #2 37 38typedef int int_type; 39void testme(X<int_type> *x1, X<float, int> *x2) { 40 (void)x1->foo(); // okay: refers to #1 41 (void)x2->bar(); // okay: refers to #2 42} 43 44// Make sure specializations are proper classes. 45template<> 46struct A<char> { 47 A(); 48}; 49 50A<char>::A() { } 51 52// Diagnose specialization errors 53struct A<double> { }; // expected-error{{template specialization requires 'template<>'}} 54 55template<typename T> // expected-error{{class template partial specialization is not yet supported}} 56struct A<T*> { }; 57 58template<> struct ::A<double>; 59 60namespace N { 61 template<typename T> struct B; // expected-note 2{{template is declared here}} 62 63 template<> struct ::N::B<char>; // okay 64 template<> struct ::N::B<short>; // okay 65 template<> struct ::N::B<int>; // okay 66 67 int f(int); 68} 69 70template<> struct N::B<int> { }; // okay 71 72template<> struct N::B<float> { }; // expected-error{{class template specialization of 'B' not in namespace 'N'}} 73 74namespace M { 75 template<> struct ::N::B<short> { }; // expected-error{{class template specialization of 'B' not in a namespace enclosing 'N'}} 76 77 template<> struct ::A<long double>; // expected-error{{class template specialization of 'A' must occur in the global scope}} 78} 79 80template<> struct N::B<char> { 81 int testf(int x) { return f(x); } 82}; 83 84