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52066eae | 1 | // { dg-do compile { target c++11 } } |
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2 | // 2009-11-12 Paolo Carlini <paolo.carlini@oracle.com> |
3 | // | |
99dee823 | 4 | // Copyright (C) 2009-2021 Free Software Foundation, Inc. |
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5 | // |
6 | // This file is part of the GNU ISO C++ Library. This library is free | |
7 | // software; you can redistribute it and/or modify it under the | |
8 | // terms of the GNU General Public License as published by the | |
9 | // Free Software Foundation; either version 3, or (at your option) | |
10 | // any later version. | |
11 | // | |
12 | // This library is distributed in the hope that it will be useful, | |
13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | // GNU General Public License for more details. | |
16 | // | |
17 | // You should have received a copy of the GNU General Public License along | |
18 | // with this library; see the file COPYING3. If not see | |
19 | // <http://www.gnu.org/licenses/>. | |
20 | ||
21 | #include <utility> | |
22 | ||
23 | template<typename From, typename To> | |
24 | struct is_convertible_mini | |
25 | { | |
26 | private: | |
27 | typedef char one; | |
28 | typedef struct { char arr[2]; } two; | |
29 | ||
30 | static one test(To); | |
31 | static two test(...); | |
32 | ||
33 | public: | |
34 | static const bool value = sizeof(test(std::declval<From>())) == 1; | |
35 | }; | |
36 | ||
37 | template<typename From, typename To> | |
38 | const bool is_convertible_mini<From, To>::value; | |
39 | ||
40 | void test01() | |
41 | { | |
42 | static_assert(is_convertible_mini<int*, const int*>::value, "#1"); | |
43 | static_assert(!is_convertible_mini<const void*, void*>::value, "#2"); | |
44 | static_assert(is_convertible_mini<float, double>::value, "#3"); | |
45 | static_assert(!is_convertible_mini<bool, int*>::value, "#4"); | |
46 | static_assert(is_convertible_mini<int(&)(int), int(*)(int)>::value, "#5"); | |
47 | static_assert(!is_convertible_mini<void*, int*>::value, "#6"); | |
48 | } |