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// Copyright (C) 2019-2025 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-do run { target c++20 } }
#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();
}
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