libstdc++-v3/testsuite/20_util/bind/is_placeholder_v.cc

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do compile }
   3
   4 // Copyright (C) 2016-2020 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 <functional>
  22
  23 struct X
  24 {
  25   int operator()() const { return 0; }
  26   int operator()() volatile { return 1; }
  27   int operator()() const volatile { return 2; }
  28   void operator()() { };
  29 };
  30
  31 static_assert( std::is_placeholder<decltype(std::placeholders::_1)>::value
  32                == std::is_placeholder_v<decltype(std::placeholders::_1)>);
  33
  34 const auto b0 = std::bind(X());
  35 static_assert( std::is_bind_expression<decltype(b0)>::value
  36                == std::is_bind_expression_v<decltype(b0)>);
  37