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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 <iterator>
#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::bidirectional_iterator_wrapper;
namespace ranges = std::ranges;
struct X { int i; };
void
test01()
{
int x[] = { {2}, {2}, {6}, {8}, {10}, {11} };
int y[] = { {2}, {6}, {8}, {10}, {11}, {2} };
int z[] = { {2}, {6}, {8}, {10}, {2}, {2} };
VERIFY( ranges::is_permutation(x, x+6, y, y+6) );
VERIFY( !ranges::is_permutation(x, x+6, y, y+5) );
test_container<int, forward_iterator_wrapper> cx(x), cy(y), cz(z);
test_range<int, forward_iterator_wrapper> rx(x), ry(y), rz(z);
VERIFY( ranges::is_permutation(cx, ry) );
VERIFY( !ranges::is_permutation(rx, cz) );
VERIFY( ranges::is_permutation(rx, cy) );
VERIFY( !ranges::is_permutation(cx, rz) );
}
void
test02()
{
static constexpr X x[] = { {2}, {2}, {6}, {8}, {10}, {11} };
static constexpr X y[] = { {2}, {6}, {8}, {10}, {11}, {2} };
static constexpr int z[] = { {2}, {6}, {8}, {10}, {2}, {2} };
static_assert(ranges::is_permutation(x, y, {}, &X::i, &X::i));
static_assert(!ranges::is_permutation(x, z, {}, &X::i));
static_assert(!ranges::is_permutation(z, y, {}, {}, &X::i));
}
void
test03()
{
int x[] = { 1, 2, 3, 4 };
int y[] = { 1, 2, 3, 3 };
test_container<int, bidirectional_iterator_wrapper> cx(x);
do
do
{
VERIFY( ranges::is_permutation(cx, x) );
VERIFY( !ranges::is_permutation(y, cx) );
} while (std::next_permutation(y, y+4));
while (std::next_permutation(std::begin(cx), std::end(cx)));
}
int
main()
{
test01();
test02();
test03();
}
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