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#ifndef QPID_INLINEALLOCATOR_H
#define QPID_INLINEALLOCATOR_H
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*/
#include <memory>
namespace qpid {
/**
* An allocator that has inline storage for up to Max objects
* of type BaseAllocator::value_type.
*/
template <class BaseAllocator, size_t Max>
class InlineAllocator : public BaseAllocator {
public:
typedef typename BaseAllocator::pointer pointer;
typedef typename BaseAllocator::size_type size_type;
typedef typename BaseAllocator::value_type value_type;
InlineAllocator() : allocated(false) {}
pointer allocate(size_type n) {
if (n <= Max && !allocated) {
allocated=true;
return store;
}
else
return BaseAllocator::allocate(n, 0);
}
void deallocate(pointer p, size_type n) {
if (p == store) allocated=false;
else BaseAllocator::deallocate(p, n);
}
template<typename T1>
struct rebind {
typedef typename BaseAllocator::template rebind<T1>::other BaseOther;
typedef InlineAllocator<BaseOther, Max> other;
};
private:
value_type store[Max];
bool allocated;
};
} // namespace qpid
#endif /*!QPID_INLINEALLOCATOR_H*/
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