libstdc++-v3/testsuite/23_containers/list/68222_neg.cc

   1 // Copyright (C) 2018 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 <list>
  21
  22 void
  23 test01()
  24 {
  25   // A list of int.
  26   const std::list<int> nums = { 1, 2, 3, 4 };
  27
  28   // Grab the iterator type.
  29   using list_itr_type = decltype( std::cbegin( nums ) );
  30
  31   // Confirm cend returns the same type.
  32   static_assert( std::is_same< decltype( std::cend( nums ) ), list_itr_type >::value, "" );
  33
  34   // The list's iterator type provides a well-formed non-member operator-() with valid return type (long int)
  35   using substraction_type
  36     = decltype( std::declval<list_itr_type>() - std::declval<list_itr_type>() ); // { dg-error "no match for 'operator-'" }
  37 }