gdb/unittests/optional/cons/copy.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_copy {
  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_copy
  45 {
  46   throwing_copy() = default;
  47   throwing_copy(throwing_copy 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 copy = o;
  58     VERIFY( !copy );
  59     VERIFY( !o );
  60   }
  61
  62   {
  63     const long val = 0x1234ABCD;
  64     gdb::optional<long> o { gdb::in_place, val};
  65     auto copy = o;
  66     VERIFY( copy );
  67     VERIFY( *copy == val );
  68 #ifndef GDB_OPTIONAL
  69     VERIFY( o && o == val );
  70 #endif
  71   }
  72
  73   {
  74     gdb::optional<tracker> o;
  75     auto copy = o;
  76     VERIFY( !copy );
  77     VERIFY( tracker::count == 0 );
  78     VERIFY( !o );
  79   }
  80
  81   {
  82     gdb::optional<tracker> o { gdb::in_place, 333 };
  83     auto copy = o;
  84     VERIFY( copy );
  85     VERIFY( copy->value == 333 );
  86     VERIFY( tracker::count == 2 );
  87     VERIFY( o && o->value == 333 );
  88   }
  89
  90   enum outcome { nothrow, caught, bad_catch };
  91
  92   {
  93     outcome result = nothrow;
  94     gdb::optional<throwing_copy> o;
  95
  96     try
  97     {
  98       auto copy = o;
  99     }
 100     catch(exception const&)
 101     { result = caught; }
 102     catch(...)
 103     { result = bad_catch; }
 104
 105     VERIFY( result == nothrow );
 106   }
 107
 108   {
 109     outcome result = nothrow;
 110     gdb::optional<throwing_copy> o { gdb::in_place };
 111
 112     try
 113     {
 114       auto copy = o;
 115     }
 116     catch(exception const&)
 117     { result = caught; }
 118     catch(...)
 119     { result = bad_catch; }
 120
 121     VERIFY( result == caught );
 122   }
 123
 124   VERIFY( tracker::count == 0 );
 125 }
 126
 127 } // namespace cons_copy