libstdc++-v3/testsuite/20_util/bind/cv_quals_3.cc

   1 // Copyright (C) 2011-2024 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 // { dg-do compile { target c++11 } }
  19
  20 #include <functional>
  21
  22 struct X
  23 {
  24   int operator()() const { return 0; }
  25   int operator()() volatile { return 1; }
  26   int operator()() const volatile { return 2; }
  27   void operator()() { };
  28 };
  29
  30 void test01()
  31 {
  32   static_assert( std::is_placeholder<decltype(std::placeholders::_1)>::value,
  33                  "decltype(_1) is a placeholder type" );
  34
  35   const auto b0 = std::bind(X());
  36   static_assert( std::is_bind_expression<decltype(b0)>::value,
  37                  "const-qualified wrapper is a bind expression" );
  38
  39   volatile auto b1 = std::bind(X());
  40   static_assert( std::is_bind_expression<decltype(b1)>::value,
  41                  "volatile-qualified wrapper is a bind expression" );
  42
  43   const volatile auto b2 = std::bind(X());
  44   static_assert( std::is_bind_expression<decltype(b2)>::value,
  45                  "const-volatile-qualified wrapper is a bind expression" );
  46
  47   const auto b3 = std::bind<int>(X());
  48   static_assert( std::is_bind_expression<decltype(b3)>::value,
  49                  "const-qualified wrapper is a bind expression" );
  50
  51   volatile auto b4 = std::bind<int>(X());
  52   static_assert( std::is_bind_expression<decltype(b4)>::value,
  53                  "volatile-qualified wrapper is a bind expression" );
  54
  55   const volatile auto b5 = std::bind<int>(X());
  56   static_assert( std::is_bind_expression<decltype(b5)>::value,
  57                  "const-volatile-qualified wrapper is a bind expression" );
  58 }
  59
  60 int main()
  61 {
  62   test01();
  63   return 0;
  64 }