libstdc++-v3/testsuite/experimental/optional/cons/copy.cc

   1 // { dg-options "-std=gnu++1y" }
   2 // { dg-do run }
   3
   4 // Copyright (C) 2013 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <experimental/optional>
  22 #include <testsuite_hooks.h>
  23
  24 struct tracker
  25 {
  26   tracker(int value) : value(value) { ++count; }
  27   ~tracker() { --count; }
  28
  29   tracker(tracker const& other) : value(other.value) { ++count; }
  30   tracker(tracker&& other) : value(other.value)
  31   {
  32     other.value = -1;
  33     ++count;
  34   }
  35
  36   tracker& operator=(tracker const&) = default;
  37   tracker& operator=(tracker&&) = default;
  38
  39   int value;
  40
  41   static int count;
  42 };
  43
  44 int tracker::count = 0;
  45
  46 struct exception { };
  47
  48 struct throwing_copy
  49 {
  50   throwing_copy() = default;
  51   throwing_copy(throwing_copy const&) { throw exception {}; }
  52 };
  53
  54 int main()
  55 {
  56   // [20.5.4.1] Constructors
  57
  58   {
  59     std::experimental::optional<long> o;
  60     auto copy = o;
  61     VERIFY( !copy );
  62     VERIFY( !o );
  63   }
  64
  65   {
  66     const long val = 0x1234ABCD;
  67     std::experimental::optional<long> o { std::experimental::in_place, val};
  68     auto copy = o;
  69     VERIFY( copy );
  70     VERIFY( *copy == val );
  71     VERIFY( o && o == val );
  72   }
  73
  74   {
  75     std::experimental::optional<tracker> o;
  76     auto copy = o;
  77     VERIFY( !copy );
  78     VERIFY( tracker::count == 0 );
  79     VERIFY( !o );
  80   }
  81
  82   {
  83     std::experimental::optional<tracker> o { std::experimental::in_place, 333 };
  84     auto copy = o;
  85     VERIFY( copy );
  86     VERIFY( copy->value == 333 );
  87     VERIFY( tracker::count == 2 );
  88     VERIFY( o && o->value == 333 );
  89   }
  90
  91   enum outcome { nothrow, caught, bad_catch };
  92
  93   {
  94     outcome result = nothrow;
  95     std::experimental::optional<throwing_copy> o;
  96
  97     try
  98     {
  99       auto copy = o;
 100     }
 101     catch(exception const&)
 102     { result = caught; }
 103     catch(...)
 104     { result = bad_catch; }
 105
 106     VERIFY( result == nothrow );
 107   }
 108
 109   {
 110     outcome result = nothrow;
 111     std::experimental::optional<throwing_copy> o { std::experimental::in_place };
 112
 113     try
 114     {
 115       auto copy = o;
 116     }
 117     catch(exception const&)
 118     { result = caught; }
 119     catch(...)
 120     { result = bad_catch; }
 121
 122     VERIFY( result == caught );
 123   }
 124
 125   VERIFY( tracker::count == 0 );
 126 }