libstdc++-v3/testsuite/20_util/result_of/1.cc

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2012-2024 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 <functional>
  21 #include <type_traits>
  22
  23 struct X {
  24   int i;
  25   void f1() { }
  26   void f2() volatile { }
  27 };
  28
  29 typedef int X::*pm;
  30 typedef void (X::*pmf1)();
  31 typedef void (X::*pmf2)() volatile;
  32
  33 typedef std::result_of<pm const&(X&)>::type result;
  34 static_assert(std::is_same<result, int&>::value,
  35               "invoking cv-qualified pointer-to-member-object");
  36
  37 typedef std::result_of<pmf1 const&(X&)>::type result1;
  38 static_assert(std::is_void<result1>::value,
  39               "invoking cv-qualified pointer-to-member-function");
  40
  41 typedef std::result_of<pmf2 const&(X&)>::type result2;
  42 static_assert(std::is_void<result2>::value,
  43               "invoking cv-qualified pointer-to-member-function");
  44
  45 typedef std::result_of<pm(volatile X&)>::type result3;
  46 static_assert(std::is_same<result3, volatile int&>::value,
  47               "invoking pointer-to-member-object on volatile object");
  48
  49 typedef std::result_of<pmf2(volatile X&)>::type result4;
  50 static_assert(std::is_void<result4>::value,
  51               "invoking pointer-to-member-function on volatile object");
  52