| // { dg-options "-std=gnu++1y" } |
| // { dg-do compile } |
| |
| // Copyright (C) 2013-2014 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 moved_to of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| #include <experimental/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)); } |
| |
| } // namespace ns |
| |
| int main() |
| { |
| using ns::value_type; |
| using O = std::experimental::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, "" ); |
| } |
| |
| { |
| constexpr O o { value_type { 11, "eleventy" } }; |
| 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), "" ); |
| } |
| } |