1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
// RUN: %clang_cc1 -fsyntax-only -verify %s
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 %s
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
template<typename T, typename U = int> struct A; // expected-note {{template is declared here}} \
// expected-note{{explicitly specialized}}
template<> struct A<double, double>; // expected-note{{forward declaration}}
template<> struct A<float, float> { // expected-note{{previous definition}}
int x;
};
template<> struct A<float> { // expected-note{{previous definition}}
int y;
};
int test_specs(A<float, float> *a1, A<float, int> *a2) {
return a1->x + a2->y;
}
int test_incomplete_specs(A<double, double> *a1,
A<double> *a2)
{
(void)a1->x; // expected-error{{member access into incomplete type}}
(void)a2->x; // expected-error{{implicit instantiation of undefined template 'A<double, int>'}}
}
typedef float FLOAT;
template<> struct A<float, FLOAT>;
template<> struct A<FLOAT, float> { }; // expected-error{{redefinition}}
template<> struct A<float, int> { }; // expected-error{{redefinition}}
template<typename T, typename U = int> struct X;
template <> struct X<int, int> { int foo(); }; // #1
template <> struct X<float> { int bar(); }; // #2
typedef int int_type;
void testme(X<int_type> *x1, X<float, int> *x2) {
(void)x1->foo(); // okay: refers to #1
(void)x2->bar(); // okay: refers to #2
}
// Make sure specializations are proper classes.
template<>
struct A<char> {
A();
};
A<char>::A() { }
// Make sure we can see specializations defined before the primary template.
namespace N{
template<typename T> struct A0;
}
namespace N {
template<>
struct A0<void> {
typedef void* pointer;
};
}
namespace N {
template<typename T>
struct A0 {
void foo(A0<void>::pointer p = 0);
};
}
// Diagnose specialization errors
struct A<double> { }; // expected-error{{template specialization requires 'template<>'}}
template<> struct ::A<double>;
namespace N {
template<typename T> struct B; // expected-note {{explicitly specialized}}
#if __cplusplus <= 199711L
// expected-note@-2 {{explicitly specialized}}
#endif
template<> struct ::N::B<char>; // okay
template<> struct ::N::B<short>; // okay
template<> struct ::N::B<int>; // okay
int f(int);
}
template<> struct N::B<int> { }; // okay
template<> struct N::B<float> { };
#if __cplusplus <= 199711L
// expected-warning@-2 {{first declaration of class template specialization of 'B' outside namespace 'N' is a C++11 extension}}
#endif
namespace M {
template<> struct ::N::B<short> { }; // expected-error{{class template specialization of 'B' not in a namespace enclosing 'N'}}
template<> struct ::A<long double>; // expected-error{{must occur at global scope}}
}
template<> struct N::B<char> {
int testf(int x) { return f(x); }
};
// PR5264
template <typename T> class Foo;
Foo<int>* v;
Foo<int>& F() { return *v; }
template <typename T> class Foo {};
Foo<int> x;
// Template template parameters
template<template<class T> class Wibble>
class Wibble<int> { }; // expected-error{{cannot specialize a template template parameter}}
namespace rdar9676205 {
template<typename T>
struct X {
template<typename U>
struct X<U*> { // expected-error{{explicit specialization of 'X' in class scope}}
};
};
}
namespace PR18009 {
template <typename T> struct A {
template <int N, int M> struct S;
template <int N> struct S<N, sizeof(T)> {};
};
A<int>::S<8, sizeof(int)> a; // ok
template <typename T> struct B {
template <int N, int M> struct S;
template <int N> struct S<N, sizeof(T) + N> {}; // ok (dr1315)
};
B<int>::S<8, sizeof(int) + 8> b;
template <typename T> struct C {
template <int N, int M> struct S;
template <int N> struct S<N, N ? **(T(*)[N])0 : 0> {}; // expected-error {{depends on a template parameter of the partial specialization}}
};
C<int> c; // expected-note {{in instantiation of}}
template<int A> struct outer {
template<int B, int C> struct inner {};
template<int C> struct inner<A * 2, C> {};
};
}
namespace PR16519 {
template<typename T, T...N> struct integer_sequence { typedef T value_type; };
#if __cplusplus <= 199711L
// expected-warning@-2 {{variadic templates are a C++11 extension}}
#endif
template<typename T> struct __make_integer_sequence;
template<typename T, T N> using make_integer_sequence = typename __make_integer_sequence<T>::template make<N, N % 2>::type;
#if __cplusplus <= 199711L
// expected-warning@-2 {{alias declarations are a C++11 extension}}
#endif
template<typename T, typename T::value_type ...Extra> struct __make_integer_sequence_impl;
#if __cplusplus <= 199711L
// expected-warning@-2 {{variadic templates are a C++11 extension}}
#endif
// Note that the following seemingly-equivalent template parameter list is
// not OK; it would result in a partial specialization that is not more
// specialized than the primary template. (See NTTPTypeVsPartialOrder below.)
//
// template<typename T, T ...N, T ...Extra>
template<typename T, T ...N, typename integer_sequence<T, N...>::value_type ...Extra>
#if __cplusplus <= 199711L
// expected-warning@-2 2{{variadic templates are a C++11 extension}}
#endif
struct __make_integer_sequence_impl<integer_sequence<T, N...>, Extra...> {
typedef integer_sequence<T, N..., sizeof...(N) + N..., Extra...> type;
};
template<typename T> struct __make_integer_sequence {
template<T N, T Parity, typename = void> struct make;
template<typename Dummy> struct make<0, 0, Dummy> { typedef integer_sequence<T> type; };
template<typename Dummy> struct make<1, 1, Dummy> { typedef integer_sequence<T, 0> type; };
template<T N, typename Dummy> struct make<N, 0, Dummy> : __make_integer_sequence_impl<make_integer_sequence<T, N/2> > {};
template<T N, typename Dummy> struct make<N, 1, Dummy> : __make_integer_sequence_impl<make_integer_sequence<T, N/2>, N - 1> {};
};
using X = make_integer_sequence<int, 5>;
#if __cplusplus <= 199711L
// expected-warning@-2 {{alias declarations are a C++11 extension}}
#endif
using X = integer_sequence<int, 0, 1, 2, 3, 4>;
#if __cplusplus <= 199711L
// expected-warning@-2 {{alias declarations are a C++11 extension}}
#endif
}
namespace NTTPTypeVsPartialOrder {
struct X { typedef int value_type; };
template<typename T> struct Y { typedef T value_type; };
template<typename T, typename T::value_type N> struct A;
template<int N> struct A<X, N> {};
template<typename T, T N> struct A<Y<T>, N> {};
A<X, 0> ax;
A<Y<int>, 0> ay;
template<int, typename T, typename T::value_type> struct B;
template<typename T, typename T::value_type N> struct B<0, T, N>;
template<int N> struct B<0, X, N> {};
template<typename T, T N> struct B<0, Y<T>, N> {};
B<0, X, 0> bx;
B<0, Y<int>, 0> by;
}
namespace DefaultArgVsPartialSpec {
// Check that the diagnostic points at the partial specialization, not just at
// the default argument.
template<typename T, int N =
sizeof(T) // ok (dr1315)
> struct X {};
template<typename T> struct X<T> {};
template<typename T,
T N = 0 // expected-note {{template parameter is declared here}}
> struct S;
template<typename T> struct S<T> {}; // expected-error {{non-type template argument specializes a template parameter with dependent type 'T'}}
}
|
