libstdc++-v3/testsuite/23_containers/unordered_multiset/insert/hash_policy.cc

   1 // { dg-options "-std=gnu++11" }
   2
   3 // Copyright (C) 2011-2016 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 <unordered_set>
  21 #include <limits>
  22 #include <ext/throw_allocator.h>
  23 #include <testsuite_hooks.h>
  24
  25 void test01()
  26 {
  27   bool test __attribute__((unused)) = true;
  28
  29   typedef std::numeric_limits<size_t> nl_size_t;
  30   std::unordered_multiset<int, std::hash<int>, std::equal_to<int>,
  31                           __gnu_cxx::throw_allocator_limit<int> > us;
  32   const int nb = 100;
  33   int scheduled_throw_counter = 0;
  34   std::size_t thrown_exceptions = 0;
  35   for (int i = 0; i != nb; ++i)
  36     {
  37       if ((float)(us.size() + 1)
  38           / (float)us.bucket_count() >= us.max_load_factor())
  39         {
  40           // We are going to need a rehash, lets introduce allocation issues:
  41           __gnu_cxx::limit_condition::set_limit(scheduled_throw_counter++);
  42         }
  43       try
  44         {
  45           us.insert(i / 2);
  46           scheduled_throw_counter = 0;
  47         }
  48       catch (const __gnu_cxx::forced_error&)
  49         {
  50           ++thrown_exceptions;
  51           --i;
  52         }
  53       VERIFY( us.load_factor() <= us.max_load_factor() );
  54       __gnu_cxx::limit_condition::set_limit(nl_size_t::max());
  55     }
  56
  57   VERIFY( thrown_exceptions != 0 );
  58   // Check that all values have been inserted:
  59   for (int i = 0; i != nb / 2; ++i)
  60     {
  61       VERIFY( us.count(i) == 2 );
  62     }
  63 }
  64
  65 int main()
  66 {
  67   test01();
  68   return 0;
  69 }