libstdc++-v3/testsuite/tr1/6_containers/hash/requirements/base_classes.cc

   1 // { dg-do compile }
   2
   3 // Copyright (C) 2007-2019 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 <tr1/functional>
  21
  22 void test01()
  23 {
  24   // Check for required base class.
  25   typedef long value_type;
  26   typedef std::tr1::hash<value_type> test_type;
  27   typedef std::unary_function<value_type, std::size_t> base_type;
  28
  29   test_type b;
  30   const test_type& obj = b;
  31   const base_type* base __attribute__((unused)) = &obj;
  32 }