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// Copyright (C) 2020 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 } }
// { dg-require-cstdint "" }
#include <algorithm>
#include <random>
#include <vector>
#include <testsuite_hooks.h>
#include <testsuite_iterators.h>
using __gnu_test::test_container;
using __gnu_test::test_range;
using __gnu_test::input_iterator_wrapper;
using __gnu_test::forward_iterator_wrapper;
using __gnu_test::random_access_iterator_wrapper;
namespace ranges = std::ranges;
void
test01()
{
for (unsigned size = 0; size < 50; ++size)
{
std::vector<int> vref(size);
std::iota(vref.begin(), vref.end(), 0);
std::vector<int> v1(vref), v2(vref);
std::ranlux48_base g1(size), g2(size + 1);
ranges::shuffle(v1, g1);
ranges::shuffle(v2, g2);
for (unsigned middle = 0; middle < 10; ++middle)
{
test_container<int, forward_iterator_wrapper> c
= {v1.data(), v1.data() + size};
test_range<int, input_iterator_wrapper> r
= {v2.data(), v2.data() + size};
std::vector<int> o1(middle), o2(middle);
test_range<int, random_access_iterator_wrapper> w1
= {o1.data(), o1.data()+middle};
test_range<int, random_access_iterator_wrapper> w2
= {o2.data(), o2.data()+middle};
auto [in1, out1] = ranges::partial_sort_copy(c.begin(), c.end(),
w1.begin(), w1.end(),
{},
std::negate<>{},
std::negate<>{});
VERIFY( in1 == c.end() );
VERIFY( out1 == w1.begin() + std::min(size, middle) );
auto [in2,out2] = ranges::partial_sort_copy(r, w2, ranges::greater{});
VERIFY( in2 == ranges::end(r) );
VERIFY( out2 == w2.begin() + std::min(size, middle) );
VERIFY( ranges::equal(w1.begin(), out1, w2.begin(), out2) );
VERIFY( ranges::equal(w1.begin(), out1,
vref.rbegin(),
vref.rbegin()+(out1-w1.begin())) );
}
}
}
constexpr bool
test02()
{
int x[] = { 5,4,1,3,2 };
int w[3];
const int y[] = { 1,2,3 };
ranges::partial_sort_copy(x, x+5, w, w+3);
return ranges::equal(w, y);
}
int
main()
{
test01();
static_assert(test02());
}
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