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a945c346 | 1 | // Copyright (C) 2019-2024 Free Software Foundation, Inc. |
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2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
bb2dd761 | 18 | // { dg-do run { target c++20 } } |
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19 | |
20 | #include <numeric> | |
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21 | #include <testsuite_hooks.h> |
22 | ||
23 | const int* p = nullptr; | |
24 | static_assert(std::is_same_v<decltype(std::midpoint(p, p)), decltype(p)>); | |
25 | // This is a GNU extension: | |
26 | static_assert(noexcept(std::midpoint(p, p))); | |
27 | ||
28 | struct test_type { }; | |
29 | template<typename T> decltype(std::midpoint((T*)0, (T*)0)) try_midpoint(int); | |
30 | template<typename T> test_type try_midpoint(...); | |
31 | template<typename T> constexpr bool no_midpoint() | |
32 | { return std::is_same_v<decltype(try_midpoint<T>()), test_type>; } | |
33 | ||
34 | static_assert(no_midpoint<void>()); | |
35 | static_assert(no_midpoint<int()>()); | |
36 | static_assert(no_midpoint<int&>()); | |
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37 | |
38 | constexpr int ca[3] = {}; | |
39 | static_assert( std::midpoint(ca, ca+3) == ca+1 ); | |
40 | ||
41 | void | |
42 | test01() | |
43 | { | |
44 | int a[4]; | |
45 | VERIFY( std::midpoint(a, a) == a ); | |
46 | VERIFY( std::midpoint(a, a+1) == a ); | |
47 | VERIFY( std::midpoint(a, a+2) == a+1 ); | |
48 | VERIFY( std::midpoint(a, a+3) == a+1 ); | |
49 | VERIFY( std::midpoint(a, a+4) == a+2 ); | |
50 | VERIFY( std::midpoint(a+1, a) == a+1 ); | |
51 | VERIFY( std::midpoint(a+2, a) == a+1 ); | |
52 | VERIFY( std::midpoint(a+3, a) == a+2 ); | |
53 | VERIFY( std::midpoint(a+4, a) == a+2 ); | |
54 | } | |
55 | ||
56 | int main() | |
57 | { | |
58 | test01(); | |
59 | } |