gdb/unittests/optional/cons/move.cc

   1 // Copyright (C) 2013-2022 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 cons_move {
  19
  20 struct tracker
  21 {
  22   tracker(int value) : value(value) { ++count; }
  23   ~tracker() { --count; }
  24
  25   tracker(tracker const& other) : value(other.value) { ++count; }
  26   tracker(tracker&& other) : value(other.value)
  27   {
  28     other.value = -1;
  29     ++count;
  30   }
  31
  32   tracker& operator=(tracker const&) = default;
  33   tracker& operator=(tracker&&) = default;
  34
  35   int value;
  36
  37   static int count;
  38 };
  39
  40 int tracker::count = 0;
  41
  42 struct exception { };
  43
  44 struct throwing_move
  45 {
  46   throwing_move() = default;
  47   throwing_move(throwing_move const&) { throw exception {}; }
  48 };
  49
  50 static void
  51 test ()
  52 {
  53   // [20.5.4.1] Constructors
  54
  55   {
  56     gdb::optional<long> o;
  57     auto moved_to = std::move(o);
  58     VERIFY( !moved_to );
  59     VERIFY( !o );
  60   }
  61
  62   {
  63     const long val = 0x1234ABCD;
  64     gdb::optional<long> o { gdb::in_place, val};
  65     auto moved_to = std::move(o);
  66     VERIFY( moved_to );
  67     VERIFY( *moved_to == val );
  68     VERIFY( o && *o == val );
  69   }
  70
  71   {
  72     gdb::optional<tracker> o;
  73     auto moved_to = std::move(o);
  74     VERIFY( !moved_to );
  75     VERIFY( tracker::count == 0 );
  76     VERIFY( !o );
  77   }
  78
  79   {
  80     gdb::optional<tracker> o { gdb::in_place, 333 };
  81     auto moved_to = std::move(o);
  82     VERIFY( moved_to );
  83     VERIFY( moved_to->value == 333 );
  84     VERIFY( tracker::count == 2 );
  85     VERIFY( o && o->value == -1 );
  86   }
  87
  88   enum outcome { nothrow, caught, bad_catch };
  89
  90   {
  91     outcome result = nothrow;
  92     gdb::optional<throwing_move> o;
  93
  94     try
  95     {
  96       auto moved_to = std::move(o);
  97     }
  98     catch(exception const&)
  99     { result = caught; }
 100     catch(...)
 101     { result = bad_catch; }
 102
 103     VERIFY( result == nothrow );
 104   }
 105
 106   {
 107     outcome result = nothrow;
 108     gdb::optional<throwing_move> o { gdb::in_place };
 109
 110     try
 111     {
 112       auto moved_to = std::move(o);
 113     }
 114     catch(exception const&)
 115     { result = caught; }
 116     catch(...)
 117     { result = bad_catch; }
 118
 119     VERIFY( result == caught );
 120   }
 121
 122   VERIFY( tracker::count == 0 );
 123 }
 124
 125 } // namespace cons_move