gdb/unittests/optional/assignment/6.cc

   1 // Copyright (C) 2013-2019 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 namespace assign_6 {
  19
  20 int counter = 0;
  21
  22 struct mixin_counter
  23 {
  24   mixin_counter() { ++counter; }
  25   mixin_counter(mixin_counter const&) { ++counter; }
  26   ~mixin_counter() { --counter; }
  27 };
  28
  29 struct value_type : private mixin_counter
  30 {
  31   value_type() = default;
  32   value_type(int) : state(1) { }
  33   value_type(std::initializer_list<char>, const char*) : state(2) { }
  34   int state = 0;
  35 };
  36
  37 void test()
  38 {
  39   using O = gdb::optional<value_type>;
  40
  41   // Check emplace
  42
  43   {
  44     O o;
  45     o.emplace();
  46     VERIFY( o && o->state == 0 );
  47   }
  48   {
  49     O o { gdb::in_place, 0 };
  50     o.emplace();
  51     VERIFY( o && o->state == 0 );
  52   }
  53
  54   {
  55     O o;
  56     o.emplace(0);
  57     VERIFY( o && o->state == 1 );
  58   }
  59   {
  60     O o { gdb::in_place };
  61     o.emplace(0);
  62     VERIFY( o && o->state == 1 );
  63   }
  64
  65 #ifndef GDB_OPTIONAL
  66   {
  67     O o;
  68     o.emplace({ 'a' }, "");
  69     VERIFY( o && o->state == 2 );
  70   }
  71   {
  72     O o { gdb::in_place };
  73     o.emplace({ 'a' }, "");
  74     VERIFY( o && o->state == 2 );
  75   }
  76 #endif
  77   {
  78     O o;
  79     VERIFY(&o.emplace(0) == &*o);
  80 #ifndef GDB_OPTIONAL
  81     VERIFY(&o.emplace({ 'a' }, "") == &*o);
  82 #endif
  83   }
  84
  85   static_assert( !std::is_constructible<O, std::initializer_list<int>, int>(), "" );
  86
  87   VERIFY( counter == 0 );
  88 }
  89
  90 } // namespace assign_6