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#ifndef QPID_REFCOUNTEDBUFFER_H
#define QPID_REFCOUNTEDBUFFER_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 <boost/utility.hpp>
#include <boost/detail/atomic_count.hpp>
#include <boost/intrusive_ptr.hpp>
namespace qpid {
/**
* Reference-counted byte buffer.
* No alignment guarantees.
*/
class RefCountedBuffer : boost::noncopyable {
mutable boost::detail::atomic_count count;
RefCountedBuffer();
void destroy() const;
char* addr() const;
public:
typedef boost::intrusive_ptr<RefCountedBuffer> intrusive_ptr;
/** Create a reference counted buffer of size n */
static intrusive_ptr create(size_t n);
/** Get a pointer to the start of the buffer. */
char* get() { return addr(); }
const char* get() const { return addr(); }
char& operator[](size_t i) { return get()[i]; }
const char& operator[](size_t i) const { return get()[i]; }
void addRef() const { ++count; }
void release() const { if (--count==0) destroy(); }
long refCount() { return count; }
};
} // namespace qpid
// intrusive_ptr support.
namespace boost {
inline void intrusive_ptr_add_ref(const qpid::RefCountedBuffer* p) { p->addRef(); }
inline void intrusive_ptr_release(const qpid::RefCountedBuffer* p) { p->release(); }
}
#endif /*!QPID_REFCOUNTEDBUFFER_H*/
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