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/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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.
*/
#ifndef UTILS_POOL_H
#define UTILS_POOL_H
#include <utils/TypeHelpers.h>
namespace android {
class PoolImpl {
public:
PoolImpl(size_t objSize);
~PoolImpl();
void* allocImpl();
void freeImpl(void* obj);
private:
size_t mObjSize;
};
/*
* A homogeneous typed memory pool for fixed size objects.
* Not intended to be thread-safe.
*/
template<typename T>
class Pool : private PoolImpl {
public:
/* Creates an initially empty pool. */
Pool() : PoolImpl(sizeof(T)) { }
/* Destroys the pool.
* Assumes that the pool is empty. */
~Pool() { }
/* Allocates an object from the pool, growing the pool if needed. */
inline T* alloc() {
void* mem = allocImpl();
if (! traits<T>::has_trivial_ctor) {
return new (mem) T();
} else {
return static_cast<T*>(mem);
}
}
/* Frees an object from the pool. */
inline void free(T* obj) {
if (! traits<T>::has_trivial_dtor) {
obj->~T();
}
freeImpl(obj);
}
};
} // namespace android
#endif // UTILS_POOL_H
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