libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs.cc

   1 // { dg-do compile }
   2 // { dg-options "-std=gnu++11" }
   3
   4 // Copyright (C) 2008-2015 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 #include <type_traits>
  23
  24 struct X {};
  25
  26 struct int_result_type { typedef int result_type; };
  27
  28 struct derives_unary : std::unary_function<int, int> {};
  29
  30 struct derives_binary : std::binary_function<int, float, int> {};
  31
  32 struct derives_unary_binary
  33   : std::unary_function<int, int>,
  34     std::binary_function<int, float, int>
  35 {
  36   typedef int result_type;
  37 };
  38
  39 void test01()
  40 {
  41   using std::reference_wrapper;
  42   using std::is_same;
  43
  44   // Check result_type typedef
  45   static_assert( is_same<reference_wrapper<int_result_type>::result_type, int>::value, "has result_type" );
  46   static_assert( is_same<reference_wrapper<derives_unary>::result_type, int>::value, "has result_type" );
  47   static_assert( is_same<reference_wrapper<derives_binary>::result_type, int>::value, "has result_type" );
  48   static_assert( is_same<reference_wrapper<derives_unary_binary>::result_type, int>::value, "has result_type" );
  49   static_assert( is_same<reference_wrapper<int(void)>::result_type, int>::value, "has result_type" );
  50   static_assert( is_same<reference_wrapper<int(*)(void)>::result_type, int>::value, "has result_type" );
  51   static_assert( is_same<reference_wrapper<int (::X::*)()>::result_type, int>::value, "has result_type" );
  52   static_assert( is_same<reference_wrapper<int (::X::*)(float)>::result_type, int>::value, "has result_type" );
  53 }
  54
  55 int main()
  56 {
  57   test01();
  58   return 0;
  59 }