gdb/unittests/optional/assignment/6.cc

   1 // Copyright (C) 2013-2023 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 static 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 static void
  38 test ()
  39 {
  40   using O = gdb::optional<value_type>;
  41
  42   // Check emplace
  43
  44   {
  45     O o;
  46     o.emplace();
  47     VERIFY( o && o->state == 0 );
  48   }
  49   {
  50     O o { gdb::in_place, 0 };
  51     o.emplace();
  52     VERIFY( o && o->state == 0 );
  53   }
  54
  55   {
  56     O o;
  57     o.emplace(0);
  58     VERIFY( o && o->state == 1 );
  59   }
  60   {
  61     O o { gdb::in_place };
  62     o.emplace(0);
  63     VERIFY( o && o->state == 1 );
  64   }
  65
  66 #ifndef GDB_OPTIONAL
  67   {
  68     O o;
  69     o.emplace({ 'a' }, "");
  70     VERIFY( o && o->state == 2 );
  71   }
  72   {
  73     O o { gdb::in_place };
  74     o.emplace({ 'a' }, "");
  75     VERIFY( o && o->state == 2 );
  76   }
  77 #endif
  78   {
  79     O o;
  80     VERIFY(&o.emplace(0) == &*o);
  81 #ifndef GDB_OPTIONAL
  82     VERIFY(&o.emplace({ 'a' }, "") == &*o);
  83 #endif
  84   }
  85
  86   static_assert( !std::is_constructible<O, std::initializer_list<int>, int>(), "" );
  87
  88   VERIFY( counter == 0 );
  89 }
  90
  91 } // namespace assign_6