1 files changed, 89 insertions, 0 deletions
diff --git a/trunk/qpid/cpp/src/qpid/RefCountedBuffer.h b/trunk/qpid/cpp/src/qpid/RefCountedBuffer.h
new file mode 100644
index 0000000000..c332325378
--- /dev/null
+++ b/trunk/qpid/cpp/src/qpid/RefCountedBuffer.h
@@ -0,0 +1,89 @@
+#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 {
+// FIXME aconway 2008-09-06: easy to add alignment
+/**
+ * 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:
+    /** Smart char pointer to a reference counted buffer */
+    class pointer {
+        boost::intrusive_ptr<RefCountedBuffer> p;
+        char* cp() const;
+        pointer(RefCountedBuffer* x);
+      friend class RefCountedBuffer;
+
+      public:
+        pointer();
+        pointer(const pointer&);
+        ~pointer();
+        pointer& operator=(const pointer&);
+        
+        char* get() { return cp(); }
+        operator char*() { return cp(); }
+        char& operator*() { return *cp(); }
+        char& operator[](size_t i) { return cp()[i]; }
+
+        const char* get() const { return cp(); }
+        operator const char*() const { return cp(); }
+        const char& operator*() const { return *cp(); }
+        const char& operator[](size_t i) const { return cp()[i]; }
+    };
+    
+    /** Create a reference counted buffer of size n */
+    static pointer 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*/