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// Copyright (C) 2011-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
//
// { dg-do run { target c++11 } }
#include <unordered_set>
#include <testsuite_hooks.h>
template<typename _USet>
void test()
{
_USet us;
typedef typename _USet::size_type size_type;
bool rehashed = false;
for (int i = 0; i != 100000; ++i)
{
size_type bkt_count = us.bucket_count();
us.insert(i);
if (bkt_count != us.bucket_count())
{
// Container has been rehashed, lets check that it won't be rehash
// again if we remove and restore the last 2 inserted elements:
rehashed = true;
bkt_count = us.bucket_count();
VERIFY( us.erase(i) == 1 );
VERIFY( bkt_count == us.bucket_count() );
if (i > 0)
{
VERIFY( us.erase(i - 1) == 1 );
VERIFY( bkt_count == us.bucket_count() );
VERIFY( us.insert(i - 1).second );
VERIFY( bkt_count == us.bucket_count() );
}
VERIFY( us.insert(i).second );
VERIFY( bkt_count == us.bucket_count() );
}
}
// At lest we check a rehash once:
VERIFY( rehashed );
}
template<typename _Value>
using unordered_set_power2_rehash =
std::_Hashtable<_Value, _Value, std::allocator<_Value>,
std::__detail::_Identity,
std::equal_to<_Value>,
std::hash<_Value>,
std::__detail::_Mask_range_hashing,
std::__detail::_Default_ranged_hash,
std::__detail::_Power2_rehash_policy,
std::__detail::_Hashtable_traits<false, true, true>>;
int main()
{
test<std::unordered_set<int>>();
test<unordered_set_power2_rehash<int>>();
return 0;
}
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