libstdc++-v3/testsuite/20_util/optional/constexpr/cons/value.cc

   1 // { dg-do compile { target c++17 }  }
   2
   3 // Copyright (C) 2013-2021 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <optional>
  21 #include <testsuite_hooks.h>
  22
  23 int main()
  24 {
  25   // [20.5.4.1] Constructors
  26
  27   {
  28     constexpr long i = 0x1234ABCD;
  29     constexpr std::optional<long> o { i };
  30     static_assert( o, "" );
  31     static_assert( *o == 0x1234ABCD, "" );
  32   }
  33
  34   {
  35     constexpr long i = 0x1234ABCD;
  36     constexpr std::optional<long> o = i;
  37     static_assert( o, "" );
  38     static_assert( *o == 0x1234ABCD, "" );
  39   }
  40
  41   {
  42     constexpr long i = 0x1234ABCD;
  43     constexpr std::optional<long> o = { i };
  44     static_assert( o, "" );
  45     static_assert( *o == 0x1234ABCD, "" );
  46   }
  47
  48   {
  49     constexpr long i = 0x1234ABCD;
  50     constexpr std::optional<long> o { std::move(i) };
  51     static_assert( o, "" );
  52     static_assert( *o == 0x1234ABCD, "" );
  53   }
  54
  55   {
  56     constexpr long i = 0x1234ABCD;
  57     constexpr std::optional<long> o = std::move(i);
  58     static_assert( o, "" );
  59     static_assert( *o == 0x1234ABCD, "" );
  60   }
  61
  62   {
  63     constexpr long i = 0x1234ABCD;
  64     constexpr std::optional<long> o = { std::move(i) };
  65     static_assert( o, "" );
  66     static_assert( *o == 0x1234ABCD, "" );
  67   }
  68   {
  69     constexpr std::optional<long> o = 42;
  70     constexpr std::optional<long> o2{o};
  71     constexpr std::optional<long> o3(o);
  72     constexpr std::optional<long> o4 = o;
  73     constexpr std::optional<long> o5;
  74     constexpr std::optional<long> o6{o5};
  75     constexpr std::optional<long> o7(o5);
  76     constexpr std::optional<long> o8 = o5;
  77     constexpr std::optional<long> o9{std::move(o)};
  78     constexpr std::optional<long> o10(std::move(o));
  79     constexpr std::optional<long> o11 = std::move(o);
  80     constexpr std::optional<long> o12;
  81     constexpr std::optional<long> o13{std::move(o5)};
  82     constexpr std::optional<long> o14(std::move(o5));
  83     constexpr std::optional<long> o15 = std::move(o5);
  84   }
  85 }