libstdc++-v3/testsuite/experimental/optional/assignment/6.cc

   1 // { dg-options "-std=gnu++14" }
   2 // { dg-do run }
   3
   4 // Copyright (C) 2013-2016 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a moved_to of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <experimental/optional>
  22 #include <testsuite_hooks.h>
  23
  24 int counter = 0;
  25
  26 struct mixin_counter
  27 {
  28   mixin_counter() { ++counter; }
  29   mixin_counter(mixin_counter const&) { ++counter; }
  30   ~mixin_counter() { --counter; }
  31 };
  32
  33 struct value_type : private mixin_counter
  34 {
  35   value_type() = default;
  36   value_type(int) : state(1) { }
  37   value_type(std::initializer_list<char>, const char*) : state(2) { }
  38   int state = 0;
  39 };
  40
  41 int main()
  42 {
  43   using O = std::experimental::optional<value_type>;
  44
  45   // Check emplace
  46
  47   {
  48     O o;
  49     o.emplace();
  50     VERIFY( o && o->state == 0 );
  51   }
  52   {
  53     O o { std::experimental::in_place, 0 };
  54     o.emplace();
  55     VERIFY( o && o->state == 0 );
  56   }
  57
  58   {
  59     O o;
  60     o.emplace(0);
  61     VERIFY( o && o->state == 1 );
  62   }
  63   {
  64     O o { std::experimental::in_place };
  65     o.emplace(0);
  66     VERIFY( o && o->state == 1 );
  67   }
  68
  69   {
  70     O o;
  71     o.emplace({ 'a' }, "");
  72     VERIFY( o && o->state == 2 );
  73   }
  74   {
  75     O o { std::experimental::in_place };
  76     o.emplace({ 'a' }, "");
  77     VERIFY( o && o->state == 2 );
  78   }
  79
  80   static_assert( !std::is_constructible<O, std::initializer_list<int>, int>(), "" );
  81
  82   VERIFY( counter == 0 );
  83 }