1 // RUN: %clang_cc1 -fsyntax-only -verify %s 2 3 template<typename T> class A; 4 5 extern "C++" { 6 template<typename T> class B; 7 } 8 9 namespace N { 10 template<typename T> class C; 11 } 12 13 extern "C" { 14 template<typename T> class D; // expected-error{{templates must have C++ linkage}} 15 } 16 17 extern "C" { 18 class PR17968 { 19 template<typename T> class D; // expected-error{{templates must have C++ linkage}} 20 template<typename T> void f(); // expected-error{{templates must have C++ linkage}} 21 }; 22 } 23 24 template<class U> class A; // expected-note{{previous template declaration is here}} 25 26 template<int N> class A; // expected-error{{template parameter has a different kind in template redeclaration}} 27 28 template<int N> class NonTypeTemplateParm; 29 30 typedef int INT; 31 32 template<INT M> class NonTypeTemplateParm; // expected-note{{previous non-type template parameter with type 'INT' (aka 'int') is here}} 33 34 template<long> class NonTypeTemplateParm; // expected-error{{template non-type parameter has a different type 'long' in template redeclaration}} 35 36 template<template<typename T> class X> class TemplateTemplateParm; 37 38 template<template<class> class Y> class TemplateTemplateParm; // expected-note{{previous template declaration is here}} \ 39 // expected-note{{previous template template parameter is here}} 40 41 template<typename> class TemplateTemplateParm; // expected-error{{template parameter has a different kind in template redeclaration}} 42 43 template<template<typename T, int> class X> class TemplateTemplateParm; // expected-error{{too many template parameters in template template parameter redeclaration}} 44 45 template<typename T> 46 struct test {}; // expected-note{{previous definition}} 47 48 template<typename T> 49 struct test : T {}; // expected-error{{redefinition}} 50 51 class X { 52 public: 53 template<typename T> class C; 54 }; 55 56 void f() { 57 template<typename T> class X; // expected-error{{expression}} 58 } 59 60 template<typename T> class X1 var; // expected-warning{{variable templates are a C++14 extension}} \ 61 // expected-error {{variable has incomplete type 'class X1'}} \ 62 // expected-note {{forward declaration of 'X1'}} 63 64 namespace M { 65 } 66 67 template<typename T> class M::C3 { }; // expected-error{{out-of-line definition of 'C3' does not match any declaration in namespace 'M'}} 68 69 namespace PR8001 { 70 template<typename T1> 71 struct Foo { 72 template<typename T2> class Bar; 73 typedef Bar<T1> Baz; 74 75 template<typename T2> 76 struct Bar { 77 Bar() {} 78 }; 79 }; 80 81 void pr8001() { 82 Foo<int>::Baz x; 83 Foo<int>::Bar<int> y(x); 84 } 85 } 86 87 namespace rdar9676205 { 88 template <unsigned, class _Tp> class tuple_element; 89 90 template <class _T1, class _T2> class pair; 91 92 template <class _T1, class _T2> 93 class tuple_element<0, pair<_T1, _T2> > 94 { 95 template <class _Tp> 96 struct X 97 { 98 template <class _Up, bool = X<_Up>::value> 99 struct Y 100 : public X<_Up>, 101 public Y<_Up> 102 { }; 103 }; 104 }; 105 } 106 107 namespace redecl { 108 int A; // expected-note {{here}} 109 template<typename T> struct A; // expected-error {{different kind of symbol}} 110 111 int B; // expected-note {{here}} 112 template<typename T> struct B { // expected-error {{different kind of symbol}} 113 }; 114 115 template<typename T> struct F; 116 template<typename T> struct K; 117 118 int G, H; // expected-note {{here}} 119 120 struct S { 121 int C; // expected-note {{here}} 122 template<typename T> struct C; // expected-error {{different kind of symbol}} 123 124 int D; // expected-note {{here}} 125 template<typename T> struct D { // expected-error {{different kind of symbol}} 126 }; 127 128 int E; 129 template<typename T> friend struct E { // expected-error {{cannot define a type in a friend}} 130 }; 131 132 int F; 133 template<typename T> friend struct F; // ok, redecl::F 134 135 template<typename T> struct G; // ok 136 137 template<typename T> friend struct H; // expected-error {{different kind of symbol}} 138 139 int I, J, K; 140 141 struct U { 142 template<typename T> struct I; // ok 143 template<typename T> struct J { // ok 144 }; 145 template<typename T> friend struct K; // ok, redecl::K 146 }; 147 }; 148 } 149 150 extern "C" template <typename T> // expected-error{{templates must have C++ linkage}} 151 void DontCrashOnThis() { 152 T &pT = T(); 153 pT; 154 } 155 156 namespace abstract_dependent_class { 157 template<typename T> struct A { 158 virtual A<T> *clone() = 0; // expected-note {{pure virtual}} 159 }; 160 template<typename T> A<T> *A<T>::clone() { return new A<T>; } // expected-error {{abstract class type 'A<T>'}} 161 } 162
