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

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do compile { target c++17 }  }
   3
   4 // Copyright (C) 2013-2021 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 <optional>
  22 #include <testsuite_hooks.h>
  23
  24 int main()
  25 {
  26   // [20.5.4.1] Constructors
  27
  28   {
  29     constexpr long i = 0x1234ABCD;
  30     constexpr std::optional<long> o { i };
  31     static_assert( o, "" );
  32     static_assert( *o == 0x1234ABCD, "" );
  33   }
  34
  35   {
  36     constexpr long i = 0x1234ABCD;
  37     constexpr std::optional<long> o = i;
  38     static_assert( o, "" );
  39     static_assert( *o == 0x1234ABCD, "" );
  40   }
  41
  42   {
  43     constexpr long i = 0x1234ABCD;
  44     constexpr std::optional<long> o = { i };
  45     static_assert( o, "" );
  46     static_assert( *o == 0x1234ABCD, "" );
  47   }
  48
  49   {
  50     constexpr long i = 0x1234ABCD;
  51     constexpr std::optional<long> o { std::move(i) };
  52     static_assert( o, "" );
  53     static_assert( *o == 0x1234ABCD, "" );
  54   }
  55
  56   {
  57     constexpr long i = 0x1234ABCD;
  58     constexpr std::optional<long> o = std::move(i);
  59     static_assert( o, "" );
  60     static_assert( *o == 0x1234ABCD, "" );
  61   }
  62
  63   {
  64     constexpr long i = 0x1234ABCD;
  65     constexpr std::optional<long> o = { std::move(i) };
  66     static_assert( o, "" );
  67     static_assert( *o == 0x1234ABCD, "" );
  68   }
  69   {
  70     constexpr std::optional<long> o = 42;
  71     constexpr std::optional<long> o2{o};
  72     constexpr std::optional<long> o3(o);
  73     constexpr std::optional<long> o4 = o;
  74     constexpr std::optional<long> o5;
  75     constexpr std::optional<long> o6{o5};
  76     constexpr std::optional<long> o7(o5);
  77     constexpr std::optional<long> o8 = o5;
  78     constexpr std::optional<long> o9{std::move(o)};
  79     constexpr std::optional<long> o10(std::move(o));
  80     constexpr std::optional<long> o11 = std::move(o);
  81     constexpr std::optional<long> o12;
  82     constexpr std::optional<long> o13{std::move(o5)};
  83     constexpr std::optional<long> o14(std::move(o5));
  84     constexpr std::optional<long> o15 = std::move(o5);
  85   }
  86 }