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-rw-r--r--cpp/src/qpid/client/PrivateImplRef.h94
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diff --git a/cpp/src/qpid/client/PrivateImplRef.h b/cpp/src/qpid/client/PrivateImplRef.h
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-#ifndef QPID_CLIENT_PRIVATEIMPL_H
-#define QPID_CLIENT_PRIVATEIMPL_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 "qpid/client/ClientImportExport.h"
-#include <boost/intrusive_ptr.hpp>
-#include "qpid/RefCounted.h"
-
-namespace qpid {
-namespace client {
-
-// FIXME aconway 2009-04-24: details!
-/** @file
- *
- * Helper class to implement a class with a private, reference counted
- * implementation and reference semantics.
- *
- * Such classes are used in the public API to hide implementation, they
- * should. Example of use:
- *
- * === Foo.h
- *
- * template <class T> PrivateImplRef;
- * class FooImpl;
- *
- * Foo : public Handle<FooImpl> {
- * public:
- * Foo(FooImpl* = 0);
- * Foo(const Foo&);
- * ~Foo();
- * Foo& operator=(const Foo&);
- *
- * int fooDo(); // and other Foo functions...
- *
- * private:
- * typedef FooImpl Impl;
- * Impl* impl;
- * friend class PrivateImplRef<Foo>;
- *
- * === Foo.cpp
- *
- * typedef PrivateImplRef<Foo> PI;
- * Foo::Foo(FooImpl* p) { PI::ctor(*this, p); }
- * Foo::Foo(const Foo& c) : Handle<FooImpl>() { PI::copy(*this, c); }
- * Foo::~Foo() { PI::dtor(*this); }
- * Foo& Foo::operator=(const Foo& c) { return PI::assign(*this, c); }
- *
- * int foo::fooDo() { return impl->fooDo(); }
- *
- */
-template <class T> class PrivateImplRef {
- public:
- typedef typename T::Impl Impl;
- typedef boost::intrusive_ptr<Impl> intrusive_ptr;
-
- static intrusive_ptr get(const T& t) { return intrusive_ptr(t.impl); }
-
- static void set(T& t, const intrusive_ptr& p) {
- if (t.impl == p) return;
- if (t.impl) boost::intrusive_ptr_release(t.impl);
- t.impl = p.get();
- if (t.impl) boost::intrusive_ptr_add_ref(t.impl);
- }
-
- // Helper functions to implement the ctor, dtor, copy, assign
- static void ctor(T& t, Impl* p) { t.impl = p; if (p) boost::intrusive_ptr_add_ref(p); }
- static void copy(T& t, const T& x) { if (&t == &x) return; t.impl = 0; assign(t, x); }
- static void dtor(T& t) { if(t.impl) boost::intrusive_ptr_release(t.impl); }
- static T& assign(T& t, const T& x) { set(t, get(x)); return t;}
-};
-
-}} // namespace qpid::client
-
-#endif /*!QPID_CLIENT_PRIVATEIMPL_H*/