libstdc++-v3/testsuite/20_util/function_objects/invoke/59768.cc

   1 // Copyright (C) 2015 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-options "-std=gnu++1z" }
  19 // { dg-do compile }
  20
  21 #include <functional>
  22
  23 struct A {
  24   void foo(int n) { }
  25 };
  26
  27 void
  28 test01()
  29 {
  30   A a;
  31   auto ref = std::ref(a);
  32   std::invoke(&A::foo, ref, 100);               // lvalue
  33   std::invoke(&A::foo, std::move(ref), 100);    // rvalue
  34   const auto refc = std::ref(a);
  35   std::invoke(&A::foo, refc, 100);              // const lvalue
  36   std::invoke(&A::foo, std::move(refc), 100);   // const rvalue
  37 }
  38
  39 int
  40 main()
  41 {
  42   test01();
  43 }