libstdc++-v3/testsuite/23_containers/unordered_set/hash_policy/load_factor.cc

   1 // Copyright (C) 2011-2021 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-do run { target c++11 } }
  19
  20 #include <unordered_set>
  21
  22 #include <testsuite_hooks.h>
  23
  24 template<typename _USet>
  25   void test()
  26   {
  27     {
  28       _USet us;
  29       for (int i = 0; i != 100000; ++i)
  30         {
  31           us.insert(i);
  32           VERIFY( us.load_factor() <= us.max_load_factor() );
  33         }
  34     }
  35     {
  36       _USet us;
  37       us.max_load_factor(3.f);
  38       for (int i = 0; i != 100000; ++i)
  39         {
  40           us.insert(i);
  41           VERIFY( us.load_factor() <= us.max_load_factor() );
  42         }
  43     }
  44     {
  45       _USet us;
  46       us.max_load_factor(.3f);
  47       for (int i = 0; i != 100000; ++i)
  48         {
  49           us.insert(i);
  50           VERIFY( us.load_factor() <= us.max_load_factor() );
  51         }
  52     }
  53   }
  54
  55 template<typename _Value>
  56   using unordered_set_power2_rehash =
  57   std::_Hashtable<_Value, _Value, std::allocator<_Value>,
  58                   std::__detail::_Identity,
  59                   std::equal_to<_Value>,
  60                   std::hash<_Value>,
  61                   std::__detail::_Mask_range_hashing,
  62                   std::__detail::_Default_ranged_hash,
  63                   std::__detail::_Power2_rehash_policy,
  64                   std::__detail::_Hashtable_traits<false, true, true>>;
  65
  66 int main()
  67 {
  68   test<std::unordered_set<int>>();
  69   test<unordered_set_power2_rehash<int>>();
  70   return 0;
  71 }