101 lines
2.9 KiB
C++
101 lines
2.9 KiB
C++
// { dg-do compile { target c++14 } }
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// Copyright (C) 2013-2019 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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#include <experimental/optional>
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#include <testsuite_hooks.h>
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namespace ns
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{
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struct value_type
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{
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int i;
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const char* s;
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};
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constexpr bool
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strcmp(const char* lhs, const char* rhs)
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{
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return *lhs == *rhs && (!*lhs || strcmp(lhs + 1, rhs + 1));
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}
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constexpr bool
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strrel(const char* lhs, const char* rhs)
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{
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return (*rhs && (!*lhs || (*lhs < *rhs)))
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|| ((*lhs && *rhs && !(*rhs < *lhs)) && strrel(lhs + 1, rhs + 1));
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}
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constexpr bool
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operator==(value_type const& lhs, value_type const& rhs)
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{ return (lhs.i == rhs.i) && strcmp(lhs.s, rhs.s); }
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constexpr bool
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operator!=(value_type const& lhs, value_type const& rhs)
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{ return !(lhs == rhs); }
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constexpr bool
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operator<(value_type const& lhs, value_type const& rhs)
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{ return (lhs.i < rhs.i) || (!(rhs.i < lhs.i) && strrel(lhs.s, rhs.s)); }
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} // namespace ns
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int main()
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{
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using ns::value_type;
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using O = std::experimental::optional<value_type>;
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constexpr value_type reference { 42, "forty-two" };
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{
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constexpr O o;
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static_assert( o < reference, "" );
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static_assert( !(reference < o), "" );
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static_assert( !(o > reference), "" );
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static_assert( reference > o, "" );
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static_assert( o <= reference, "" );
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static_assert( !(reference <= o), "" );
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static_assert( !(o >= reference), "" );
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static_assert( reference >= o, "" );
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}
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{
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constexpr O o { value_type { 11, "eleventy" } };
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static_assert( o < reference, "" );
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static_assert( !(reference < o), "" );
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static_assert( !(o > reference), "" );
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static_assert( reference > o, "" );
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static_assert( o <= reference, "" );
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static_assert( !(reference <= o), "" );
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static_assert( !(o >= reference), "" );
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static_assert( reference >= o, "" );
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}
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{
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constexpr O o { value_type { 42, "forty-two" } };
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static_assert( !(o < reference), "" );
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static_assert( !(reference < o), "" );
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static_assert( !(o > reference), "" );
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static_assert( !(reference > o), "" );
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static_assert( o <= reference, "" );
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static_assert( reference <= o, "" );
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static_assert( o >= reference, "" );
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static_assert( reference >= o, "" );
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}
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}
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