libcruft-util/alloc/arena.ipp

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2015-11-13 17:17:37 +11:00
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2015 Danny Robson <danny@nerdcruft.net>
*/
#ifdef __UTIL_ALLOC_ARENA_IPP
#error
#endif
#define __UTIL_ALLOC_ARENA_IPP
///////////////////////////////////////////////////////////////////////////////
template <class T>
util::alloc::arena<T>::arena (T &store):
m_store (store)
{ ; }
///////////////////////////////////////////////////////////////////////////////
template <class T>
template <typename U, typename ...Args>
U*
util::alloc::arena<T>::acquire (Args&& ...args)
{
U *data = m_store.allocate (sizeof (U), alignof (U));
try {
new (data) U (std::forward (args)...);
} catch (...) {
m_store.deallocate (data, sizeof (U));
throw;
}
}
//-----------------------------------------------------------------------------
template <class T>
template <typename U, typename ...Args>
std::unique_ptr<U>
util::alloc::arena<T>::unique (Args&& ...args)
{
return std::unique_ptr<U> (acquire (std::forward (args)...));
}
//-----------------------------------------------------------------------------
template <class T>
template <typename U>
void
util::alloc::arena<T>::release (U *u)
{
u->~U ();
m_store.deallocate (u);
}