| 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 | |
| 82 | template<> struct ::N::B<char>; // okay |
| 83 | template<> struct ::N::B<short>; // okay |
| 84 | template<> struct ::N::B<int>; // okay |
| 85 | |
| 86 | int f(int); |
| 87 | } |
| 88 | |
| 89 | template<> struct N::B<int> { }; // okay |
| 90 | |
| 91 | template<> struct N::B<float> { }; |
| 92 | |
| 93 | |
| 94 | namespace M { |
| 95 | template<> struct ::N::B<short> { }; // expected-error{{class template specialization of 'B' not in a namespace enclosing 'N'}} |
| 96 | |
| 97 | template<> struct ::A<long double>; // expected-error{{must occur at global scope}} |
| 98 | } |
| 99 | |
| 100 | template<> struct N::B<char> { |
| 101 | int testf(int x) { return f(x); } |
| 102 | }; |
| 103 | |
| 104 | // PR5264 |
| 105 | template <typename T> class Foo; |
| 106 | Foo<int>* v; |
| 107 | Foo<int>& F() { return *v; } |
| 108 | template <typename T> class Foo {}; |
| 109 | Foo<int> x; |
| 110 | |
| 111 | |
| 112 | // Template template parameters |
| 113 | template<template<class T> class Wibble> |
| 114 | class Wibble<int> { }; // expected-error{{cannot specialize a template template parameter}} |
| 115 | |
| 116 | namespace rdar9676205 { |
| 117 | template<typename T> |
| 118 | struct X { // expected-note {{here}} |
| 119 | template<typename U> |
| 120 | struct X<U*> { // expected-error{{partial specialization of 'X' not in a namespace enclosing}} |
| 121 | }; |
| 122 | }; |
| 123 | |
| 124 | } |
| 125 | |
| 126 | namespace PR18009 { |
| 127 | template <typename T> struct A { |
| 128 | template <int N, int M> struct S; |
| 129 | template <int N> struct S<N, sizeof(T)> {}; |
| 130 | }; |
| 131 | A<int>::S<8, sizeof(int)> a; // ok |
| 132 | |
| 133 | template <typename T> struct B { |
| 134 | template <int N, int M> struct S; |
| 135 | template <int N> struct S<N, sizeof(T) + N> {}; // ok (dr1315) |
| 136 | }; |
| 137 | B<int>::S<8, sizeof(int) + 8> b; |
| 138 | |
| 139 | template <typename T> struct C { |
| 140 | template <int N, int M> struct S; |
| 141 | template <int N> struct S<N, N ? **(T(*)[N])0 : 0> {}; // expected-error {{depends on a template parameter of the partial specialization}} |
| 142 | }; |
| 143 | C<int> c; // expected-note {{in instantiation of}} |
| 144 | |
| 145 | template<int A> struct outer { |
| 146 | template<int B, int C> struct inner {}; |
| 147 | template<int C> struct inner<A * 2, C> {}; |
| 148 | }; |
| 149 | } |
| 150 | |
| 151 | namespace PR16519 { |
| 152 | template<typename T, T...N> struct integer_sequence { typedef T value_type; }; |
| 153 | #if __cplusplus <= 199711L |
| 154 | // expected-warning@-2 {{variadic templates are a C++11 extension}} |
| 155 | #endif |
| 156 | |
| 157 | template<typename T> struct __make_integer_sequence; |
| 158 | template<typename T, T N> using make_integer_sequence = typename __make_integer_sequence<T>::template make<N, N % 2>::type; |
| 159 | #if __cplusplus <= 199711L |
| 160 | // expected-warning@-2 {{alias declarations are a C++11 extension}} |
| 161 | #endif |
| 162 | |
| 163 | template<typename T, typename T::value_type ...Extra> struct __make_integer_sequence_impl; |
| 164 | #if __cplusplus <= 199711L |
| 165 | // expected-warning@-2 {{variadic templates are a C++11 extension}} |
| 166 | #endif |
| 167 | |
| 168 | // Note that the following seemingly-equivalent template parameter list is |
| 169 | // not OK; it would result in a partial specialization that is not more |
| 170 | // specialized than the primary template. (See NTTPTypeVsPartialOrder below.) |
| 171 | // |
| 172 | // template<typename T, T ...N, T ...Extra> |
| 173 | template<typename T, T ...N, typename integer_sequence<T, N...>::value_type ...Extra> |
| 174 | #if __cplusplus <= 199711L |
| 175 | // expected-warning@-2 2{{variadic templates are a C++11 extension}} |
| 176 | #endif |
| 177 | struct __make_integer_sequence_impl<integer_sequence<T, N...>, Extra...> { |
| 178 | typedef integer_sequence<T, N..., sizeof...(N) + N..., Extra...> type; |
| 179 | }; |
| 180 | |
| 181 | template<typename T> struct __make_integer_sequence { |
| 182 | template<T N, T Parity, typename = void> struct make; |
| 183 | template<typename Dummy> struct make<0, 0, Dummy> { typedef integer_sequence<T> type; }; |
| 184 | template<typename Dummy> struct make<1, 1, Dummy> { typedef integer_sequence<T, 0> type; }; |
| 185 | template<T N, typename Dummy> struct make<N, 0, Dummy> : __make_integer_sequence_impl<make_integer_sequence<T, N/2> > {}; |
| 186 | template<T N, typename Dummy> struct make<N, 1, Dummy> : __make_integer_sequence_impl<make_integer_sequence<T, N/2>, N - 1> {}; |
| 187 | }; |
| 188 | |
| 189 | using X = make_integer_sequence<int, 5>; |
| 190 | #if __cplusplus <= 199711L |
| 191 | // expected-warning@-2 {{alias declarations are a C++11 extension}} |
| 192 | #endif |
| 193 | |
| 194 | using X = integer_sequence<int, 0, 1, 2, 3, 4>; |
| 195 | #if __cplusplus <= 199711L |
| 196 | // expected-warning@-2 {{alias declarations are a C++11 extension}} |
| 197 | #endif |
| 198 | } |
| 199 | |
| 200 | namespace NTTPTypeVsPartialOrder { |
| 201 | struct X { typedef int value_type; }; |
| 202 | template<typename T> struct Y { typedef T value_type; }; |
| 203 | |
| 204 | template<typename T, typename T::value_type N> struct A; |
| 205 | template<int N> struct A<X, N> {}; |
| 206 | template<typename T, T N> struct A<Y<T>, N> {}; |
| 207 | A<X, 0> ax; |
| 208 | A<Y<int>, 0> ay; |
| 209 | |
| 210 | |
| 211 | template<int, typename T, typename T::value_type> struct B; |
| 212 | template<typename T, typename T::value_type N> struct B<0, T, N>; |
| 213 | template<int N> struct B<0, X, N> {}; |
| 214 | template<typename T, T N> struct B<0, Y<T>, N> {}; |
| 215 | B<0, X, 0> bx; |
| 216 | B<0, Y<int>, 0> by; |
| 217 | } |
| 218 | |
| 219 | namespace DefaultArgVsPartialSpec { |
| 220 | // Check that the diagnostic points at the partial specialization, not just at |
| 221 | // the default argument. |
| 222 | template<typename T, int N = |
| 223 | sizeof(T) // ok (dr1315) |
| 224 | > struct X {}; |
| 225 | template<typename T> struct X<T> {}; |
| 226 | |
| 227 | template<typename T, |
| 228 | T N = 0 // expected-note {{template parameter is declared here}} |
| 229 | > struct S; |
| 230 | template<typename T> struct S<T> {}; // expected-error {{non-type template argument specializes a template parameter with dependent type 'T'}} |
| 231 | } |
| 232 | |