| // Copyright (C) 2019-2021 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // { dg-options "-std=gnu++2a" } |
| // { dg-do run { target c++2a } } |
| |
| #include <numeric> |
| #include <testsuite_hooks.h> |
| |
| const int* p = nullptr; |
| static_assert(std::is_same_v<decltype(std::midpoint(p, p)), decltype(p)>); |
| // This is a GNU extension: |
| static_assert(noexcept(std::midpoint(p, p))); |
| |
| struct test_type { }; |
| template<typename T> decltype(std::midpoint((T*)0, (T*)0)) try_midpoint(int); |
| template<typename T> test_type try_midpoint(...); |
| template<typename T> constexpr bool no_midpoint() |
| { return std::is_same_v<decltype(try_midpoint<T>()), test_type>; } |
| |
| static_assert(no_midpoint<void>()); |
| static_assert(no_midpoint<int()>()); |
| static_assert(no_midpoint<int&>()); |
| |
| constexpr int ca[3] = {}; |
| static_assert( std::midpoint(ca, ca+3) == ca+1 ); |
| |
| void |
| test01() |
| { |
| int a[4]; |
| VERIFY( std::midpoint(a, a) == a ); |
| VERIFY( std::midpoint(a, a+1) == a ); |
| VERIFY( std::midpoint(a, a+2) == a+1 ); |
| VERIFY( std::midpoint(a, a+3) == a+1 ); |
| VERIFY( std::midpoint(a, a+4) == a+2 ); |
| VERIFY( std::midpoint(a+1, a) == a+1 ); |
| VERIFY( std::midpoint(a+2, a) == a+1 ); |
| VERIFY( std::midpoint(a+3, a) == a+2 ); |
| VERIFY( std::midpoint(a+4, a) == a+2 ); |
| } |
| |
| int main() |
| { |
| test01(); |
| } |