libstdc++-v3/testsuite/20_util/function/cons/callable.cc

   1 // { dg-do compile { target c++11 } }
   2 // { dg-require-effective-target hosted }
   3
   4 // Copyright (C) 2012-2024 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
  23 void* f(std::function<void()>) { return nullptr; }
  24 int f(std::function<void(int)>) { return 1; }
  25
  26 void test01()
  27 {
  28   void* p __attribute__((unused));
  29   int i __attribute__((unused));
  30
  31   p = f([] { });
  32   i = f([] (int) { });
  33 }
  34
  35 void g(std::function<void()>) { }
  36 void h(std::function<int(int)>) { }
  37
  38 void test02()
  39 {
  40   g([] { return "ignored"; });
  41   h([] (char c) { return c; });
  42 }
  43
  44 int main()
  45 {
  46   test01();
  47   test02();
  48
  49   return 0;
  50 }