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// Copyright (C) 2019-2024 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 <algorithm>
#include <array>
#include <testsuite_hooks.h>
#include <testsuite_iterators.h>
// Lambda that calls lexicographical_compare_three_way on two ranges.
// Arguments are passed by value intentionally, so that a copy of the range
// is traversed and the original is not modified. Otherwise when the range
// has input iterators the range will be consumed after the first comparison.
auto lexicomp3 = [](auto r1, auto r2) {
return std::lexicographical_compare_three_way(r1.begin(), r1.end(),
r2.begin(), r2.end());
};
void
test01()
{
using __gnu_test::test_container;
using __gnu_test::input_iterator_wrapper;
using __gnu_test::forward_iterator_wrapper;
int arr1[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
int arr2[] = { 0, 1, 2, 3, 4, 5, 6, 777 };
{
test_container<int, input_iterator_wrapper> c1(arr1);
test_container<int, input_iterator_wrapper> c2(arr2);
VERIFY( lexicomp3(c1, c1) == 0 );
VERIFY( lexicomp3(c1, c2) < 0 );
VERIFY( lexicomp3(c2, c1) > 0 );
}
{
test_container<int, input_iterator_wrapper> c1(arr1, arr1+6);
test_container<int, input_iterator_wrapper> c2(arr2, arr2+6);
VERIFY( lexicomp3(c1, c1) == 0 );
VERIFY( lexicomp3(c1, c2) == 0 );
VERIFY( lexicomp3(c2, c1) == 0 );
}
{
test_container<int, input_iterator_wrapper> c1(arr1);
test_container<int, input_iterator_wrapper> c2(arr2, arr2+7);
VERIFY( lexicomp3(c1, c1) == 0 );
VERIFY( lexicomp3(c1, c2) > 0 );
VERIFY( lexicomp3(c2, c1) < 0 );
}
{
test_container<int, input_iterator_wrapper> c1(arr1);
test_container<int, forward_iterator_wrapper> c2(arr2);
VERIFY( lexicomp3(c1, c1) == 0 );
VERIFY( lexicomp3(c1, c2) < 0 );
VERIFY( lexicomp3(c2, c1) > 0 );
}
{
test_container<int, input_iterator_wrapper> c1(arr1);
test_container<int, forward_iterator_wrapper> c2(arr2, arr2+7);
VERIFY( lexicomp3(c1, c1) == 0 );
VERIFY( lexicomp3(c2, c2) == 0 );
VERIFY( lexicomp3(c1, c2) > 0 );
VERIFY( lexicomp3(c2, c1) < 0 );
}
{
test_container<int, forward_iterator_wrapper> c1(arr1, arr1+7);
test_container<int, input_iterator_wrapper> c2(arr2);
VERIFY( lexicomp3(c1, c1) == 0 );
VERIFY( lexicomp3(c2, c2) == 0 );
VERIFY( lexicomp3(c1, c2) < 0 );
VERIFY( lexicomp3(c2, c1) > 0 );
}
}
void
test02()
{
using __gnu_test::test_container;
using __gnu_test::input_iterator_wrapper;
using __gnu_test::forward_iterator_wrapper;
std::array<unsigned char, 8> c1 = { 0, 1, 2, 3, 4, 5, 6, 7 };
std::array<unsigned char, 8> c2 = { 0, 1, 2, 3, 4, 5, 6, 77 };
VERIFY( lexicomp3(c1, c1) == 0 );
VERIFY( lexicomp3(c1, c2) < 0 );
VERIFY( lexicomp3(c2, c1) > 0 );
std::array<unsigned char, 7> c3 = { 0, 1, 2, 3, 4, 5, 6 };
VERIFY( lexicomp3(c3, c3) == 0 );
VERIFY( lexicomp3(c1, c3) > 0 );
VERIFY( lexicomp3(c3, c1) < 0 );
}
void
test03()
{
unsigned char a[2] = { 1, 2 };
unsigned char* p = nullptr;
// ensure memcmp not called with nullptr
VERIFY( std::lexicographical_compare_three_way(p, p, a, a+2) < 0 );
VERIFY( std::lexicographical_compare_three_way(a, a+2, p, p) > 0 );
}
int
main()
{
test01();
test02();
test03();
}
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