qmf/Handle.h Source File

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qmf/Handle.h
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    00001 #ifndef QMF_HANDLE_H
    00002 #define QMF_HANDLE_H
    00003
    00004 /*
    00005  *
    00006  * Licensed to the Apache Software Foundation (ASF) under one
    00007  * or more contributor license agreements.  See the NOTICE file
    00008  * distributed with this work for additional information
    00009  * regarding copyright ownership.  The ASF licenses this file
    00010  * to you under the Apache License, Version 2.0 (the
    00011  * "License"); you may not use this file except in compliance
    00012  * with the License.  You may obtain a copy of the License at
    00013  *
    00014  *   http://www.apache.org/licenses/LICENSE-2.0
    00015  *
    00016  * Unless required by applicable law or agreed to in writing,
    00017  * software distributed under the License is distributed on an
    00018  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    00019  * KIND, either express or implied.  See the License for the
    00020  * specific language governing permissions and limitations
    00021  * under the License.
    00022  *
    00023  */
    00024
    00025 #include "qmf/ImportExport.h"
    00026
    00027 namespace qmf {
    00028
    00029 template <class> class PrivateImplRef;
    00030
    00038 template <class T> class Handle {
    00039   public:
    00040
    00042     QMF_INLINE_EXTERN bool isValid() const { return impl; }
    00043
    00045     QMF_INLINE_EXTERN bool isNull() const { return !impl; }
    00046
    00048     QMF_INLINE_EXTERN operator bool() const { return impl; }
    00049
    00051     QMF_INLINE_EXTERN bool operator !() const { return !impl; }
    00052
    00053     void swap(Handle<T>& h) { T* t = h.impl; h.impl = impl; impl = t; }
    00054
    00055   protected:
    00056     typedef T Impl;
    00057     QMF_INLINE_EXTERN Handle() :impl() {}
    00058
    00059     // Not implemented,subclasses must implement.
    00060     QMF_EXTERN Handle(const Handle&);
    00061     QMF_EXTERN Handle& operator=(const Handle&);
    00062
    00063     Impl* impl;
    00064
    00065   friend class PrivateImplRef<T>;
    00066 };
    00067
    00068 } // namespace qmf
    00069
    00070 #endif