1 // RUN: %clang_cc1 -fsyntax-only -verify %s 2 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 %s 3 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s 4 template<typename T, typename U = int> struct A; // expected-note {{template is declared here}} \ 5 // expected-note{{explicitly specialized}} 6 7 template<> struct A<double, double>; // expected-note{{forward declaration}} 8 9 template<> struct A<float, float> { // expected-note{{previous definition}} 10 int x; 11 }; 12 13 template<> struct A<float> { // expected-note{{previous definition}} 14 int y; 15 }; 16 17 int test_specs(A<float, float> *a1, A<float, int> *a2) { 18 return a1->x + a2->y; 19 } 20 21 int test_incomplete_specs(A<double, double> *a1, 22 A<double> *a2) 23 { 24 (void)a1->x; // expected-error{{member access into incomplete type}} 25 (void)a2->x; // expected-error{{implicit instantiation of undefined template 'A<double, int>'}} 26 } 27 28 typedef float FLOAT; 29 30 template<> struct A<float, FLOAT>; 31 32 template<> struct A<FLOAT, float> { }; // expected-error{{redefinition}} 33 34 template<> struct A<float, int> { }; // expected-error{{redefinition}} 35 36 template<typename T, typename U = int> struct X; 37 38 template <> struct X<int, int> { int foo(); }; // #1 39 template <> struct X<float> { int bar(); }; // #2 40 41 typedef int int_type; 42 void testme(X<int_type> *x1, X<float, int> *x2) { 43 (void)x1->foo(); // okay: refers to #1 44 (void)x2->bar(); // okay: refers to #2 45 } 46 47 // Make sure specializations are proper classes. 48 template<> 49 struct A<char> { 50 A(); 51 }; 52 53 A<char>::A() { } 54 55 // Make sure we can see specializations defined before the primary template. 56 namespace N{ 57 template<typename T> struct A0; 58 } 59 60 namespace N { 61 template<> 62 struct A0<void> { 63 typedef void* pointer; 64 }; 65 } 66 67 namespace N { 68 template<typename T> 69 struct A0 { 70 void foo(A0<void>::pointer p = 0); 71 }; 72 } 73 74 // Diagnose specialization errors 75 struct A<double> { }; // expected-error{{template specialization requires 'template<>'}} 76 77 template<> struct ::A<double>; 78 79 namespace N { 80 template<typename T> struct B; // expected-note {{explicitly specialized}} 81 #if __cplusplus <= 199711L 82 // expected-note@-2 {{explicitly specialized}} 83 #endif 84 85 template<> struct ::N::B<char>; // okay 86 template<> struct ::N::B<short>; // okay 87 template<> struct ::N::B<int>; // okay 88 89 int f(int); 90 } 91 92 template<> struct N::B<int> { }; // okay 93 94 template<> struct N::B<float> { }; 95 #if __cplusplus <= 199711L 96 // expected-warning@-2 {{first declaration of class template specialization of 'B' outside namespace 'N' is a C++11 extension}} 97 #endif 98 99 100 namespace M { 101 template<> struct ::N::B<short> { }; // expected-error{{class template specialization of 'B' not in a namespace enclosing 'N'}} 102 103 template<> struct ::A<long double>; // expected-error{{must occur at global scope}} 104 } 105 106 template<> struct N::B<char> { 107 int testf(int x) { return f(x); } 108 }; 109 110 // PR5264 111 template <typename T> class Foo; 112 Foo<int>* v; 113 Foo<int>& F() { return *v; } 114 template <typename T> class Foo {}; 115 Foo<int> x; 116 117 118 // Template template parameters 119 template<template<class T> class Wibble> 120 class Wibble<int> { }; // expected-error{{cannot specialize a template template parameter}} 121 122 namespace rdar9676205 { 123 template<typename T> 124 struct X { 125 template<typename U> 126 struct X<U*> { // expected-error{{explicit specialization of 'X' in class scope}} 127 }; 128 }; 129 130 } 131 132 namespace PR18009 { 133 template <typename T> struct A { 134 template <int N, int M> struct S; 135 template <int N> struct S<N, sizeof(T)> {}; 136 }; 137 A<int>::S<8, sizeof(int)> a; // ok 138 139 template <typename T> struct B { 140 template <int N, int M> struct S; // expected-note {{declared here}} 141 template <int N> struct S<N, sizeof(T) + 142 N // expected-error {{non-type template argument depends on a template parameter of the partial specialization}} 143 > {}; 144 }; 145 B<int>::S<8, sizeof(int) + 8> s; // expected-error {{undefined}} 146 147 template<int A> struct outer { 148 template<int B, int C> struct inner {}; 149 template<int C> struct inner<A * 2, C> {}; 150 }; 151 } 152 153 namespace PR16519 { 154 template<typename T, T...N> struct integer_sequence { typedef T value_type; }; 155 #if __cplusplus <= 199711L 156 // expected-warning@-2 {{variadic templates are a C++11 extension}} 157 #endif 158 159 template<typename T> struct __make_integer_sequence; 160 template<typename T, T N> using make_integer_sequence = typename __make_integer_sequence<T>::template make<N, N % 2>::type; 161 #if __cplusplus <= 199711L 162 // expected-warning@-2 {{alias declarations are a C++11 extension}} 163 #endif 164 165 template<typename T, typename T::value_type ...Extra> struct __make_integer_sequence_impl; 166 #if __cplusplus <= 199711L 167 // expected-warning@-2 {{variadic templates are a C++11 extension}} 168 #endif 169 170 template<typename T, T ...N, T ...Extra> struct __make_integer_sequence_impl<integer_sequence<T, N...>, Extra...> { 171 #if __cplusplus <= 199711L 172 // expected-warning@-2 2 {{variadic templates are a C++11 extension}} 173 #endif 174 typedef integer_sequence<T, N..., sizeof...(N) + N..., Extra...> type; 175 }; 176 177 template<typename T> struct __make_integer_sequence { 178 template<T N, T Parity, typename = void> struct make; 179 template<typename Dummy> struct make<0, 0, Dummy> { typedef integer_sequence<T> type; }; 180 template<typename Dummy> struct make<1, 1, Dummy> { typedef integer_sequence<T, 0> type; }; 181 template<T N, typename Dummy> struct make<N, 0, Dummy> : __make_integer_sequence_impl<make_integer_sequence<T, N/2> > {}; 182 template<T N, typename Dummy> struct make<N, 1, Dummy> : __make_integer_sequence_impl<make_integer_sequence<T, N/2>, N - 1> {}; 183 }; 184 185 using X = make_integer_sequence<int, 5>; 186 #if __cplusplus <= 199711L 187 // expected-warning@-2 {{alias declarations are a C++11 extension}} 188 #endif 189 190 using X = integer_sequence<int, 0, 1, 2, 3, 4>; 191 #if __cplusplus <= 199711L 192 // expected-warning@-2 {{alias declarations are a C++11 extension}} 193 #endif 194 } 195 196 namespace DefaultArgVsPartialSpec { 197 // Check that the diagnostic points at the partial specialization, not just at 198 // the default argument. 199 template<typename T, int N = 200 sizeof(T) // expected-note {{template parameter is used in default argument declared here}} 201 > struct X {}; 202 template<typename T> struct X<T> {}; // expected-error {{non-type template argument depends on a template parameter of the partial specialization}} 203 204 template<typename T, 205 T N = 0 // expected-note {{template parameter is declared here}} 206 > struct S; 207 template<typename T> struct S<T> {}; // expected-error {{non-type template argument specializes a template parameter with dependent type 'T'}} 208 } 209
