source: XMLIO_V2/external/include/Poco/SingletonHolder.h @ 80

Last change on this file since 80 was 80, checked in by ymipsl, 14 years ago

ajout lib externe

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1//
2// SingletonHolder.h
3//
4// $Id: //poco/1.3/Foundation/include/Poco/SingletonHolder.h#1 $
5//
6// Library: Foundation
7// Package: Core
8// Module:  SingletonHolder
9//
10// Definition of the SingletonHolder template.
11//
12// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
13// and Contributors.
14//
15// Permission is hereby granted, free of charge, to any person or organization
16// obtaining a copy of the software and accompanying documentation covered by
17// this license (the "Software") to use, reproduce, display, distribute,
18// execute, and transmit the Software, and to prepare derivative works of the
19// Software, and to permit third-parties to whom the Software is furnished to
20// do so, all subject to the following:
21//
22// The copyright notices in the Software and this entire statement, including
23// the above license grant, this restriction and the following disclaimer,
24// must be included in all copies of the Software, in whole or in part, and
25// all derivative works of the Software, unless such copies or derivative
26// works are solely in the form of machine-executable object code generated by
27// a source language processor.
28//
29// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
30// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
31// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
32// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
33// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
34// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
35// DEALINGS IN THE SOFTWARE.
36//
37
38
39#ifndef Foundation_SingletonHolder_INCLUDED
40#define Foundation_SingletonHolder_INCLUDED
41
42
43#include "Poco/Foundation.h"
44#include "Poco/Mutex.h"
45
46
47namespace Poco {
48
49
50template <class S>
51class SingletonHolder
52        /// This is a helper template class for managing
53        /// singleton objects allocated on the heap.
54        /// The class ensures proper deletion (including
55        /// calling of the destructor) of singleton objects
56        /// when the application that created them terminates.
57{
58public:
59        SingletonHolder()
60                /// Creates the SingletonHolder.
61        {
62                _pS = 0;
63        }
64        ~SingletonHolder()
65                /// Destroys the SingletonHolder and the singleton
66                /// object that it holds.
67        {
68                delete _pS;
69        }
70        S* get()
71                /// Returns a pointer to the singleton object
72                /// hold by the SingletonHolder. The first call
73                /// to get will create the singleton.
74        {
75                FastMutex::ScopedLock lock(_m);
76                if (!_pS) _pS = new S;
77                return _pS;
78        }
79       
80private:
81        S* _pS;
82        FastMutex _m;
83};
84
85
86} // namespace Poco
87
88
89#endif // Foundation_SingletonHolder_INCLUDED
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