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// Copyright (C) 2020-2022 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 <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::output_iterator_wrapper;
using __gnu_test::forward_iterator_wrapper;
namespace ranges = std::ranges;
void
test01()
{
int x[] = {4,2,1,1,0};
int y[] = {3,2,1};
int z[3];
test_range<int, input_iterator_wrapper> rx(x), ry(y);
test_range<int, output_iterator_wrapper> rz(z);
auto [in,out]
= ranges::set_difference(rx, ry, rz.begin(), ranges::greater{});
VERIFY( in.ptr == x+5 );
VERIFY( out.ptr == z+3 );
VERIFY( ranges::equal(z, (int[]){4,1,0}) );
}
void
test02()
{
int x[] = {3,2,1,1,0};
int y[] = {3,2,2,1,0};
int z[1];
test_container<int, forward_iterator_wrapper> rx(x), ry(y);
test_container<int, forward_iterator_wrapper> rz(z);
auto [in,out]
= ranges::set_difference(rx.begin(), rx.end(),
ry.begin(), ry.end(),
rz.begin(),
{},
std::negate<>{},
std::negate<>{});
VERIFY( in.ptr == x+5 );
VERIFY( out.ptr == z+1 );
VERIFY( ranges::equal(z, (int[]){1}) );
}
constexpr bool
test03()
{
bool ok = true;
int x[1] = {0};
int y[1] = {1};
int z[1];
ok &= ranges::set_difference(x, x, y, y+1, z).out == z;
ok &= ranges::set_difference(x, x+1, y, y, z).out == z+1;
ok &= z[0] == 0;
return ok;
}
int
main()
{
test01();
test02();
static_assert(test03());
}