libstdc++-v3/testsuite/20_util/function_objects/not_fn/87538.cc

   1 // Copyright (C) 2018-2019 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++17" }
  19 // { dg-do run { target c++17 } }
  20
  21 #include <functional>
  22 #include <testsuite_hooks.h>
  23
  24 struct N {
  25   int operator()(int i) { if (i == 0) throw -1; return i; }
  26 };
  27
  28 void
  29 test01()
  30 {
  31   N n;
  32   auto not_n = std::not_fn(n);
  33   static_assert( !noexcept(not_n(1)) );
  34   VERIFY(not_n(1) == 0);
  35   int exception = 0;
  36   try {
  37     not_n(0);
  38   }
  39   catch (int e) {
  40     exception = e;
  41   }
  42   VERIFY(exception == -1);
  43 }
  44
  45 int
  46 main()
  47 {
  48   test01();
  49 }