Sophie: libCommonC++1.9_3-devel-1.9.4-2mdk i586

libCommonC++1.9_3-devel-1.9.4-2mdk.i586.rpm

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<hr><h1>instance.h</h1><a href="instance_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <font class="comment">// Copyright (C) 2001 Open Source Telecom Corporation.</font>
00002 <font class="comment">//  </font>
00003 <font class="comment">// This program is free software; you can redistribute it and/or modify</font>
00004 <font class="comment">// it under the terms of the GNU General Public License as published by</font>
00005 <font class="comment">// the Free Software Foundation; either version 2 of the License, or</font>
00006 <font class="comment">// (at your option) any later version.</font>
00007 <font class="comment">// </font>
00008 <font class="comment">// This program is distributed in the hope that it will be useful,</font>
00009 <font class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00010 <font class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</font>
00011 <font class="comment">// GNU General Public License for more details.</font>
00012 <font class="comment">// </font>
00013 <font class="comment">// You should have received a copy of the GNU General Public License</font>
00014 <font class="comment">// along with this program; if not, write to the Free Software </font>
00015 <font class="comment">// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.</font>
00016 <font class="comment">// </font>
00017 <font class="comment">// As a special exception to the GNU General Public License, permission is </font>
00018 <font class="comment">// granted for additional uses of the text contained in its release </font>
00019 <font class="comment">// of Common C++.</font>
00020 <font class="comment">// </font>
00021 <font class="comment">// The exception is that, if you link the Common C++ library with other</font>
00022 <font class="comment">// files to produce an executable, this does not by itself cause the</font>
00023 <font class="comment">// resulting executable to be covered by the GNU General Public License.</font>
00024 <font class="comment">// Your use of that executable is in no way restricted on account of</font>
00025 <font class="comment">// linking the Common C++ library code into it.</font>
00026 <font class="comment">// </font>
00027 <font class="comment">// This exception does not however invalidate any other reasons why</font>
00028 <font class="comment">// the executable file might be covered by the GNU General Public License.</font>
00029 <font class="comment">// </font>
00030 <font class="comment">// This exception applies only to the code released under the </font>
00031 <font class="comment">// name Common C++.  If you copy code from other releases into a copy of</font>
00032 <font class="comment">// Common C++, as the General Public License permits, the exception does</font>
00033 <font class="comment">// not apply to the code that you add in this way.  To avoid misleading</font>
00034 <font class="comment">// anyone as to the status of such modified files, you must delete</font>
00035 <font class="comment">// this exception notice from them.</font>
00036 <font class="comment">// </font>
00037 <font class="comment">// If you write modifications of your own for Common C++, it is your choice</font>
00038 <font class="comment">// whether to permit this exception to apply to your modifications.</font>
00039 <font class="comment">// If you do not wish that, delete this exception notice.  </font>
00040 
00041 <font class="keyword">namespace </font>ost {
00042 
00043 template &lt;class T&gt;
<a name="l00044"></a><a class="code" href="classost_1_1_instance.html">00044</a> <font class="keyword">class </font>Instance : <font class="keyword">private</font> <a class="code" href="class_r_w_lock.html">RWLock</a>
00045 {
00046 <font class="keyword">protected</font>:
00047         <font class="keyword">static</font> T* objPointer;
<a name="l00048"></a><a class="code" href="classost_1_1_instance.html#n0">00048</a>         <font class="keywordtype">unsigned</font> objCount;
<a name="l00049"></a><a class="code" href="classost_1_1_instance.html#n1">00049</a>         <font class="keywordtype">bool</font> objPurge;
00050         
<a name="l00051"></a><a class="code" href="classost_1_1_instance.html#b0">00051</a>         <a class="code" href="classost_1_1_instance.html#b0">Instance</a>()<font class="keyword"></font>
00052 <font class="keyword">        </font>{
00053                 WriteLock();
00054                 <font class="keywordflow">if</font>(objPointer)
00055                 {
00056                         <font class="keywordflow">if</font>(objPointer-&gt;objCount)
00057                                 objPointer-&gt;objPurge = <font class="keyword">true</font>;
00058                         <font class="keywordflow">else</font>            
00059                                 <font class="keyword">delete</font> objPointer;
00060                 }
00061                 objPointer = <font class="keyword">this</font>;
00062                 objCount = 0;
00063                 objPurge = <font class="keyword">false</font>;
00064                 Unlock();
00065         }
00066 <font class="keyword">public</font>:
00067         <font class="keyword">static</font> T *<a class="code" href="classost_1_1_instance.html#d0">getInstance</a>(<font class="keywordtype">void</font>);
00068         
<a name="l00069"></a><a class="code" href="classost_1_1_instance.html#a0">00069</a>         <font class="keywordtype">void</font> <a class="code" href="classost_1_1_instance.html#a0">endInstance</a>()<font class="keyword"></font>
00070 <font class="keyword">        </font>{       
00071                 --objcount;
00072                 <font class="keywordflow">if</font>(!objCount &amp;&amp; objPurge)
00073                         <font class="keyword">delete</font> <font class="keyword">this</font>;
00074         }               
00075 };
00076 
00077 template &lt;class T&gt;
<a name="l00078"></a><a class="code" href="classost_1_1_instance.html#q0">00078</a> T *Instance&lt;T&gt;::objPointer = NULL;
00079 
00080 template &lt;class T&gt;
<a name="l00081"></a><a class="code" href="classost_1_1_instance.html#d0">00081</a> T *Instance&lt;T&gt;::getInstance(<font class="keywordtype">void</font>)<font class="keyword"></font>
00082 <font class="keyword"></font>{
00083         Instance&lt;T&gt; *ptr;
00084         ReadLock();
00085         ptr = Instance&lt;T&gt;::objPointer;
00086         ptr-&gt;objCount++;
00087         Unlock();
00088         return &lt;T *&gt;ptr;
00089 }
00090 
00091 
00092 };
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