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// Copyright (C) 2020-2023 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 <algorithm>
#include <ranges>
#include <testsuite_hooks.h>
#include <testsuite_iterators.h>
using __gnu_test::test_range;
using __gnu_test::forward_iterator_wrapper;
namespace ranges = std::ranges;
namespace views = ranges::views;
void
test01()
{
int x[] = {1,2,1,3};
auto v = x | views::common;
VERIFY( std::count(v.begin(), v.end(), 1) == 2);
static_assert(ranges::common_range<decltype(v)>);
static_assert(ranges::view<decltype(v)>);
static_assert(ranges::random_access_range<decltype(v)>);
static_assert(std::same_as<decltype(v), decltype(views::common(v))>);
auto v2 = v | (views::common | views::common);
VERIFY( std::count(v2.begin(), v2.end(), 1) == 2);
}
void
test02()
{
int x[] = {1,2,1,3};
test_range<int, forward_iterator_wrapper> rx(x);
auto v = ranges::common_view(rx);
VERIFY( std::count(v.begin(), v.end(), 1) == 2);
static_assert(ranges::common_range<decltype(v)>);
static_assert(ranges::view<decltype(v)>);
static_assert(ranges::forward_range<decltype(v)>);
static_assert(std::same_as<decltype(v), decltype(views::common(v))>);
auto v2 = v | (views::common | views::common);
VERIFY( std::count(v2.begin(), v2.end(), 1) == 2);
}
template<auto common = views::common>
void
test03()
{
// Verify SFINAE behavior.
static_assert(!requires { common(); });
static_assert(!requires { common(0, 0); });
static_assert(!requires { common(0); });
static_assert(!requires { 0 | common; });
}
int
main()
{
test01();
test02();
test03();
}
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