70 lines
1.9 KiB
C++
70 lines
1.9 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 2011-2016 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_POOL_HPP
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#define __UTIL_POOL_HPP
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#include "nocopy.hpp"
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#include <cstdlib>
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namespace util {
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/// a simple pre-allocated pool for storage of PODs.
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///
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/// non-POD types can be stored, but there are no guarantees for calling
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/// item destructors at pool destruction time.
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template <typename T>
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class pool : public nocopy {
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protected:
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union node {
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node *_node;
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char _data[sizeof (T)];
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};
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node *m_head; // root address of allocation
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node *m_next; // next available entry in the linked list
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const size_t m_capacity;
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size_t m_size;
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public:
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explicit
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pool (unsigned int _capacity);
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~pool ();
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// Data management
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template <typename ...Args>
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T* acquire (Args&... args);
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void release (T *data);
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size_t capacity (void) const;
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size_t size (void) const;
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bool empty (void) const;
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// Indexing
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size_t index (const T*) const;
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T& operator[] (size_t idx) &;
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const T& operator[] (size_t idx) const&;
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};
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}
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#include "pool.ipp"
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#endif // __UTIL_POOL_HPP
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