Danny Robson
0e3fa05f05
ipp files weren't a great way of keeping things clean, and IDEs have a little trouble dealing with the split configuration. this simplifies debugging a great deal.
93 lines
2.6 KiB
C++
93 lines
2.6 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2015 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_ALLOC_ARENA_HPP
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#define __UTIL_ALLOC_ARENA_HPP
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#include "../memory/deleter.hpp"
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#include <memory>
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#include <utility>
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namespace util::alloc {
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/// wraps a block allocator with an interface suitable for allocating
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/// individual objects.
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template <class T>
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class arena {
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public:
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explicit arena (T &store):
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m_store (store)
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{ ; }
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//---------------------------------------------------------------------
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template <typename U, typename ...Args>
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U*
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acquire (Args&&... args)
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{
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U *data = reinterpret_cast<U*> (
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m_store.allocate (sizeof (U), alignof (U))
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);
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try {
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new (data) U (std::forward<Args> (args)...);
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} catch (...) {
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m_store.deallocate (data, sizeof (U));
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throw;
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}
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return data;
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}
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//---------------------------------------------------------------------
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template <typename U>
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void
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release (U *u)
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{
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u->~U ();
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m_store.deallocate (reinterpret_cast<void*> (u), sizeof (U));
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}
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//---------------------------------------------------------------------
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template <typename U>
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using deleter_t = util::memory::owner_deleter<
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U,arena<T>,&arena::release
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>;
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template <typename U>
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using unique_t = std::unique_ptr<U,deleter_t<U>>;
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// the return type must be auto and the implementation must be inline
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// otherwise we trigger an internal compiler error in gcc-5.2.0
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// "sorry, unimplemented: mangling offset_ref"
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template <typename U, typename ...Args>
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auto
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unique (Args&& ...args)
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{
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return unique_t<U> {
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acquire<U> (std::forward<Args> (args)...),
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deleter_t<U> (*this)
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};
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}
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private:
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T &m_store;
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};
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}
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#endif
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