/usr/share/cruisecontrol-bin-2.6.1/projects/qpid-trunk/cpp/src/qpid/sys/ScopedIncrement.h

00001 #ifndef _posix_ScopedIncrement_h
00002 #define _posix_ScopedIncrement_h
00003 
00004 /*
00005  *
00006  * Copyright (c) 2006 The Apache Software Foundation
00007  *
00008  * Licensed under the Apache License, Version 2.0 (the "License");
00009  * you may not use this file except in compliance with the License.
00010  * You may obtain a copy of the License at
00011  *
00012  *    http://www.apache.org/licenses/LICENSE-2.0
00013  *
00014  * Unless required by applicable law or agreed to in writing, software
00015  * distributed under the License is distributed on an "AS IS" BASIS,
00016  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00017  * See the License for the specific language governing permissions and
00018  * limitations under the License.
00019  *
00020  */
00021 
00022 #include <boost/noncopyable.hpp>
00023 #include <boost/function.hpp>
00024 
00025 namespace qpid {
00026 namespace sys {
00027 
00033 template <class T, class F=boost::function<void()> >
00034 class ScopedIncrement : boost::noncopyable
00035 {
00036   public:
00037     ScopedIncrement(T& c, F f=0)
00038         : count(c), callback(f) { ++count; }
00039     ~ScopedIncrement() { if (--count == 0 && callback) callback(); }
00040 
00041   private:
00042     T& count;
00043     F callback;
00044 };
00045 
00046 
00048 template <class T>
00049 class ScopedDecrement : boost::noncopyable
00050 {
00051   public:
00052     ScopedDecrement(T& c) : count(c) { value = --count; }
00053     ~ScopedDecrement() { ++count; }
00054 
00056     operator long() { return value; }
00057 
00058   private:
00059     T& count;
00060     long value;
00061 };
00062 
00063 
00064 }}
00065 
00066 
00067 #endif // _posix_ScopedIncrement_h

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