gdb/unittests/optional/assignment/5.cc

   1 // Copyright (C) 2013-2021 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_5 {
  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 static void
  32 test ()
  33 {
  34   using O = gdb::optional<value_type>;
  35
  36   // Check std::nullopt_t and 'default' (= {}) assignment
  37
  38 #ifndef GDB_OPTIONAL
  39   {
  40     O o;
  41     o = std::nullopt;
  42     VERIFY( !o );
  43   }
  44 #endif
  45
  46 #ifndef GDB_OPTIONAL
  47   {
  48     O o { gdb::in_place };
  49     o = std::nullopt;
  50     VERIFY( !o );
  51   }
  52 #endif
  53
  54 #ifndef GDB_OPTIONAL
  55   {
  56     O o;
  57     o = {};
  58     VERIFY( !o );
  59   }
  60 #endif
  61
  62 #ifndef GDB_OPTIONAL
  63   {
  64     O o { gdb::in_place };
  65     o = {};
  66     VERIFY( !o );
  67   }
  68 #endif
  69   {
  70     gdb::optional<std::vector<int>> ovi{{1, 2, 3}};
  71     VERIFY(ovi->size() == 3);
  72     VERIFY((*ovi)[0] == 1 && (*ovi)[1] == 2 && (*ovi)[2] == 3);
  73     ovi = {4, 5, 6, 7};
  74     VERIFY(ovi->size() == 4);
  75     VERIFY((*ovi)[0] == 4 && (*ovi)[1] == 5 &&
  76            (*ovi)[2] == 6 && (*ovi)[3] == 7);
  77   }
  78   VERIFY( counter == 0 );
  79 }
  80
  81 } // namespace assign_5