text: // 2005-01-26 Douglas Gregor <doug.gregor -at- gmail.com>
  //
  // Copyright (C) 2005-2017 Free Software Foundation, Inc.
  //
  // This file is part of the GNU ISO C++ Library.  This library is free
  // software; you can redistribute it and/or modify it under the
  // terms of the GNU General Public License as published by the
  // Free Software Foundation; either version 3, or (at your option)
  // any later version.
  //
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  // GNU General Public License for more details.
  //
  // You should have received a copy of the GNU General Public License along
  // with this library; see the file COPYING3.  If not see
  // <http://www.gnu.org/licenses/>.
  
  // 3.4 function return types
  #include <tr1/functional>
  #include <tr1/type_traits>
  #include <testsuite_hooks.h>
  #include <testsuite_tr1.h>
  
  class X {};
  
  struct int_result_type { typedef int result_type; };
  
  struct int_result_of
  {
    template<typename F> struct result { typedef int type; };
  };
  
  struct int_result_type_and_float_result_of
  {
    typedef int result_type;
    template<typename F> struct result { typedef float type; };
  };
  
  void test01()
  {
    using std::tr1::result_of;
    using std::tr1::is_same;
    using namespace __gnu_test;
  
    typedef int (*func_ptr)(float, double);
    typedef int (&func_ref)(float, double);
    typedef int (::X::*mem_func_ptr)(float);
    typedef int (::X::*mem_func_ptr_c)(float) const;
    typedef int (::X::*mem_func_ptr_v)(float) volatile;
    typedef int (::X::*mem_func_ptr_cv)(float) const volatile;
  
    VERIFY((is_same<result_of<int_result_type(float)>::type, int>::value));
    VERIFY((is_same<result_of<int_result_of(double)>::type, int>::value));
    VERIFY((is_same<result_of<int_result_of(void)>::type, void>::value));
    VERIFY((is_same<result_of<const int_result_of(double)>::type, int>::value));
    VERIFY((is_same<result_of<volatile int_result_of(void)>::type, void>::value));
    VERIFY((is_same<result_of<int_result_type_and_float_result_of(char)>::type, int>::value));
    VERIFY((is_same<result_of<func_ptr(char, float)>::type, int>::value));
    VERIFY((is_same<result_of<func_ref(char, float)>::type, int>::value));
    VERIFY((is_same<result_of<mem_func_ptr(::X,char)>::type, int>::value));
    VERIFY((is_same<result_of<mem_func_ptr_c(::X,char)>::type, int>::value));
    VERIFY((is_same<result_of<mem_func_ptr_v(::X,char)>::type, int>::value));
    VERIFY((is_same<result_of<mem_func_ptr_cv(::X,char)>::type, int>::value));
  }
  
  int main()
  {
    test01();
    return 0;
  }
  