libstdc++-v3/testsuite/20_util/result_of/2.cc

   1 // { dg-options "-std=gnu++11" }
   2 // { dg-do compile }
   3
   4 // Copyright (C) 2012-2015 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 <type_traits>
  22 #include <memory>
  23
  24 using std::is_same;
  25 using std::result_of;
  26 using std::unique_ptr;
  27
  28 // Taken from example in [meta.trans.other]
  29
  30 typedef bool (&PF1)();
  31 typedef short (*PF2)(long);
  32 struct S {
  33   operator PF2() const;
  34   double operator()(char, int&);
  35   void fn(long) const;
  36   char data;
  37 };
  38
  39 typedef void (S::*PMF)(long) const;
  40 typedef char S::*PMD;
  41
  42 static_assert( is_same<result_of<S(int)>::type, short>::value, "!");
  43 static_assert( is_same<result_of<S&(unsigned char, int&)>::type, double>::value, "!");
  44 static_assert( is_same<result_of<PF1()>::type, bool>::value, "!");
  45 static_assert( is_same<result_of<PMF(unique_ptr<S>, int)>::type, void>::value, "!");
  46 static_assert( is_same<result_of<PMD(S)>::type, char&&>::value, "!");
  47 static_assert( is_same<result_of<PMD(const S*)>::type, const char&>::value, "!");