89 lines
2.0 KiB
C++
89 lines
2.0 KiB
C++
// { dg-options "-std=gnu++17" }
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// { dg-do run { target c++17 } }
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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 <optional>
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#include <testsuite_hooks.h>
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int counter = 0;
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struct mixin_counter
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{
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mixin_counter() { ++counter; }
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mixin_counter(mixin_counter const&) { ++counter; }
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~mixin_counter() { --counter; }
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};
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struct value_type : private mixin_counter
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{
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value_type() = default;
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value_type(int) : state(1) { }
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value_type(std::initializer_list<char>, const char*) : state(2) { }
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int state = 0;
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};
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int main()
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{
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using O = std::optional<value_type>;
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// Check emplace
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{
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O o;
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o.emplace();
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VERIFY( o && o->state == 0 );
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}
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{
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O o { std::in_place, 0 };
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o.emplace();
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VERIFY( o && o->state == 0 );
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}
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{
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O o;
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o.emplace(0);
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VERIFY( o && o->state == 1 );
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}
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{
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O o { std::in_place };
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o.emplace(0);
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VERIFY( o && o->state == 1 );
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}
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{
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O o;
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o.emplace({ 'a' }, "");
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VERIFY( o && o->state == 2 );
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}
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{
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O o { std::in_place };
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o.emplace({ 'a' }, "");
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VERIFY( o && o->state == 2 );
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}
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{
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O o;
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VERIFY(&o.emplace(0) == &*o);
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VERIFY(&o.emplace({ 'a' }, "") == &*o);
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}
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static_assert( !std::is_constructible<O, std::initializer_list<int>, int>(), "" );
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VERIFY( counter == 0 );
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}
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