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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 <forward_list>
#include <testsuite_hooks.h>
void
test01()
{
std::forward_list<int> c1{ 1, 2, 3 }, c2{ 1, 2, 3, 4 }, c3{ 1, 2, 4 };
VERIFY( c1 == c1 );
VERIFY( std::is_eq(c1 <=> c1) );
VERIFY( c1 < c2 );
VERIFY( std::is_lt(c1 <=> c2) );
VERIFY( c1 < c3 );
VERIFY( std::is_lt(c1 <=> c3) );
VERIFY( c2 < c3 );
VERIFY( std::is_lt(c2 <=> c3) );
static_assert( std::totally_ordered<std::forward_list<int>> );
static_assert( std::three_way_comparable<std::forward_list<int>,
std::strong_ordering> );
static_assert( ! std::three_way_comparable<std::forward_list<float>,
std::strong_ordering> );
static_assert( ! std::three_way_comparable<std::forward_list<float>,
std::weak_ordering> );
static_assert( std::three_way_comparable<std::forward_list<float>,
std::partial_ordering> );
struct E
{
bool operator==(E) { return true; }
};
static_assert( ! std::totally_ordered<std::forward_list<E>> );
static_assert( ! std::three_way_comparable<E> );
static_assert( ! std::three_way_comparable<std::forward_list<E>> );
}
void
test02()
{
struct W
{
int value = 0;
bool operator==(W rhs) const noexcept
{ return (value | 1) == (rhs.value | 1); }
std::weak_ordering
operator<=>(W rhs) const noexcept
{ return (value | 1) <=> (rhs.value | 1); }
};
static_assert( std::totally_ordered<std::forward_list<W>> );
std::forward_list<W> c1{ {1}, {2}, {3} }, c2{ {0}, {3}, {3} };
static_assert( std::same_as<decltype(c1 <=> c1), std::weak_ordering> );
VERIFY( c1 == c2 );
VERIFY( std::is_eq(c1 <=> c2) );
}
void
test03()
{
struct P
{
int value = 0;
bool operator==(P rhs) const noexcept
{
if (value < 0 || rhs.value < 0)
return false;
return value == rhs.value;
}
std::partial_ordering
operator<=>(P rhs) const noexcept
{
if (value < 0 || rhs.value < 0)
return std::partial_ordering::unordered;
return value <=> rhs.value;
}
};
static_assert( std::totally_ordered<std::forward_list<P>> );
std::forward_list<P> c{ {1}, {2}, {-3} };
static_assert( std::three_way_comparable<P> );
static_assert( std::same_as<decltype(c <=> c), std::partial_ordering> );
VERIFY( (c <=> c) == std::partial_ordering::unordered );
}
void
test04()
{
struct L
{
int value = 0;
bool operator<(L rhs) const noexcept { return value < rhs.value; }
};
static_assert( std::totally_ordered<std::forward_list<L>> );
std::forward_list<L> c{ {1}, {2}, {3} }, d{ {1}, {2}, {3}, {4} };
static_assert( std::same_as<decltype(c <=> c), std::weak_ordering> );
VERIFY( std::is_lt(c <=> d) );
}
static_assert( ! std::totally_ordered<std::forward_list<int>::iterator> );
static_assert( ! std::three_way_comparable<std::forward_list<int>::iterator> );
int
main()
{
test01();
test02();
test03();
test04();
}