74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
/*
|
|
* 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>
|
|
*/
|
|
|
|
#ifndef __UTIL_ALLOC_ARENA_HPP
|
|
#define __UTIL_ALLOC_ARENA_HPP
|
|
|
|
#include "../memory/deleter.hpp"
|
|
|
|
#include <memory>
|
|
#include <utility>
|
|
|
|
namespace util::alloc {
|
|
/// wraps a block allocator with an interface suitable for allocating
|
|
/// individual objects.
|
|
template <class T>
|
|
class arena {
|
|
public:
|
|
explicit arena (T &store);
|
|
|
|
//---------------------------------------------------------------------
|
|
template <typename U, typename ...Args>
|
|
U*
|
|
acquire (Args&&...);
|
|
|
|
//---------------------------------------------------------------------
|
|
template <typename U>
|
|
void
|
|
release (U*);
|
|
|
|
//---------------------------------------------------------------------
|
|
template <typename U>
|
|
using deleter_t = util::memory::owner_deleter<
|
|
U,arena<T>,&arena::release
|
|
>;
|
|
|
|
template <typename U>
|
|
using unique_t = std::unique_ptr<U,deleter_t<U>>;
|
|
|
|
// the return type must be auto and the implementation must be inline
|
|
// otherwise we trigger an internal compiler error in gcc-5.2.0
|
|
// "sorry, unimplemented: mangling offset_ref"
|
|
template <typename U, typename ...Args>
|
|
auto
|
|
unique (Args&& ...args)
|
|
{
|
|
return unique_t<U> {
|
|
acquire<U> (std::forward<Args> (args)...),
|
|
deleter_t<U> (*this)
|
|
};
|
|
}
|
|
|
|
|
|
private:
|
|
T &m_store;
|
|
};
|
|
}
|
|
|
|
#include "arena.ipp"
|
|
|
|
#endif
|