libstdc++-v3/testsuite/19_diagnostics/error_condition/hash.cc

   1 // Copyright (C) 2019-2021 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 <system_error>
  22 #include <testsuite_hooks.h>
  23
  24 struct error_cat : std::error_category
  25 {
  26   error_cat(std::string s) : _name(s) { }
  27   std::string _name;
  28   const char* name() const noexcept override { return _name.c_str(); }
  29   std::string message(int) const override { return "error"; }
  30 };
  31
  32 void
  33 test01()
  34 {
  35   std::hash<std::error_condition> h;
  36   error_cat kitty("kitty"), moggy("moggy");
  37   std::error_condition cond1(99, kitty);
  38   VERIFY( h(cond1) == h(cond1) );
  39   std::error_condition cond2(99, kitty);
  40   VERIFY( h(cond1) == h(cond2) );
  41   std::error_condition cond3(88, kitty);
  42   VERIFY( h(cond1) != h(cond3) );
  43   std::error_condition cond4(99, moggy);
  44   VERIFY( h(cond1) != h(cond4) );
  45 }
  46
  47 int
  48 main()
  49 {
  50   test01();
  51 }