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// { dg-options "-std=gnu++17" }
// { dg-do compile { target c++17 } }
// Copyright (C) 2013-2019 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/>.
#include <optional>
#include <testsuite_hooks.h>
namespace ns
{
struct value_type
{
int i;
const char* s;
};
constexpr bool
strcmp(const char* lhs, const char* rhs)
{
return *lhs == *rhs && (!*lhs || strcmp(lhs + 1, rhs + 1));
}
constexpr bool
strrel(const char* lhs, const char* rhs)
{
return (*rhs && (!*lhs || (*lhs < *rhs)))
|| ((*lhs && *rhs && !(*rhs < *lhs)) && strrel(lhs + 1, rhs + 1));
}
constexpr bool
operator==(value_type const& lhs, value_type const& rhs)
{ return (lhs.i == rhs.i) && strcmp(lhs.s, rhs.s); }
constexpr bool
operator!=(value_type const& lhs, value_type const& rhs)
{ return !(lhs == rhs); }
constexpr bool
operator<(value_type const& lhs, value_type const& rhs)
{ return (lhs.i < rhs.i) || (!(rhs.i < lhs.i) && strrel(lhs.s, rhs.s)); }
constexpr bool
operator>(value_type const& lhs, value_type const& rhs)
{ return rhs < lhs; }
constexpr bool
operator<=(value_type const& lhs, value_type const& rhs)
{ return lhs < rhs || lhs == rhs; }
constexpr bool
operator>=(value_type const& lhs, value_type const& rhs)
{ return lhs > rhs || lhs == rhs; }
} // namespace ns
int main()
{
using ns::value_type;
using O = std::optional<value_type>;
constexpr value_type reference { 42, "forty-two" };
{
constexpr O o;
static_assert( o < reference, "" );
static_assert( !(reference < o), "" );
static_assert( !(o > reference), "" );
static_assert( reference > o, "" );
static_assert( o <= reference, "" );
static_assert( !(reference <= o), "" );
static_assert( !(o >= reference), "" );
static_assert( reference >= o, "" );
}
{
constexpr O o { value_type { 11, "eleventy" } };
static_assert( o < reference, "" );
static_assert( !(reference < o), "" );
static_assert( !(o > reference), "" );
static_assert( reference > o, "" );
static_assert( o <= reference, "" );
static_assert( !(reference <= o), "" );
static_assert( !(o >= reference), "" );
static_assert( reference >= o, "" );
}
{
constexpr O o { value_type { 42, "forty-two" } };
static_assert( !(o < reference), "" );
static_assert( !(reference < o), "" );
static_assert( !(o > reference), "" );
static_assert( !(reference > o), "" );
static_assert( o <= reference, "" );
static_assert( reference <= o, "" );
static_assert( o >= reference, "" );
static_assert( reference >= o, "" );
}
}
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