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 | |