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<hr><h1>smart_ptr.h</h1><a href="smart__ptr_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001
00007 <font class="comment">/* Copyright, 2000 Nevrax Ltd.</font>
00008 <font class="comment"> *</font>
00009 <font class="comment"> * This file is part of NEVRAX NEL.</font>
00010 <font class="comment"> * NEVRAX NEL is free software; you can redistribute it and/or modify</font>
00011 <font class="comment"> * it under the terms of the GNU General Public License as published by</font>
00012 <font class="comment"> * the Free Software Foundation; either version 2, or (at your option)</font>
00013 <font class="comment"> * any later version.</font>
00014 <font class="comment"></font>
00015 <font class="comment"> * NEVRAX NEL is distributed in the hope that it will be useful, but</font>
00016 <font class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00017 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</font>
00018 <font class="comment"> * General Public License for more details.</font>
00019 <font class="comment"></font>
00020 <font class="comment"> * You should have received a copy of the GNU General Public License</font>
00021 <font class="comment"> * along with NEVRAX NEL; see the file COPYING. If not, write to the</font>
00022 <font class="comment"> * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,</font>
00023 <font class="comment"> * MA 02111-1307, USA.</font>
00024 <font class="comment"> */</font>
00025
00026 <font class="preprocessor">#ifndef NL_SMART_PTR_H</font>
00027 <font class="preprocessor"></font><font class="preprocessor">#define NL_SMART_PTR_H</font>
00028 <font class="preprocessor"></font>
00029
00030 <font class="preprocessor">#include "<a class="code" href="types__nl_8h.html">nel/misc/types_nl.h</a>"</font>
00031
00032 <font class="preprocessor">#include <stdio.h></font>
00033
00034
00035 <font class="keyword">namespace </font>NLMISC
00036 {
00037
00038
00039 <font class="comment">// ***************************************************************************</font>
<a name="l00047"></a><a class="code" href="classNLMISC_1_1CRefCount.html">00047</a> <font class="comment"></font><font class="keyword">class </font>CRefCount
00048 {
00049 <font class="keyword">public</font>:
00050 <font class="comment">// The instance handle.</font>
00051 <font class="comment">// Can't put those to private since must be used by CRefPtr (and friend doesn't work with template).</font>
<a name="l00052"></a><a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html">00052</a> <font class="keyword">struct </font><a class="code" href="classNLMISC_1_1CRefCount.html#l0">CPtrInfo</a>
00053 {
<a name="l00054"></a><a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#m0">00054</a> <font class="keywordtype">void</font> *<a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#m0">Ptr</a>; <font class="comment">// to know if the instance is valid.</font>
<a name="l00055"></a><a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#m1">00055</a> sint <a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#m1">RefCount</a>; <font class="comment">// RefCount of ptrinfo (!= instance)</font>
00056 <font class="comment">// For fu... dll problems, must use a flag to mark NullPtrInfo.</font>
<a name="l00057"></a><a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#m2">00057</a> <font class="keywordtype">bool</font> <a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#m2">IsNullPtrInfo</a>;
00058
<a name="l00059"></a><a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#a0">00059</a> <a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#a0">CPtrInfo</a>(<font class="keywordtype">void</font> *p) {<a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#m0">Ptr</a>=p; <a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#m1">RefCount</a>=0; <a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#m2">IsNullPtrInfo</a>=<font class="keyword">false</font>;}
00060 <font class="comment">// Just for internal use, to mark our Null pointer.</font>
<a name="l00061"></a><a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#a1">00061</a> <a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#a0">CPtrInfo</a>(<font class="keywordtype">char</font> ) {<a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#m0">Ptr</a>=NULL; <a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#m1">RefCount</a>=0x7FFFFFFF; <a class="code" href="structNLMISC_1_1CRefCount_1_1CPtrInfo.html#m2">IsNullPtrInfo</a>=<font class="keyword">true</font>;}
00062 };
00063
00064 <font class="comment">// OWN null for ref ptr. (Optimisations!!!)</font>
00065 <font class="keyword">static</font> <a class="code" href="classNLMISC_1_1CRefCount.html#l0">CPtrInfo</a> <a class="code" href="classNLMISC_1_1CRefCount.html#p0">NullPtrInfo</a>;
<a name="l00066"></a><a class="code" href="classNLMISC_1_1CRefCount.html#l0">00066</a> <font class="keyword">friend</font> <font class="keyword">struct </font><a class="code" href="classNLMISC_1_1CRefCount.html#l0">CPtrInfo</a>;
00067
00068 <font class="keyword">public</font>:
00069 <font class="comment">// Can't put this to private since must be used by CSmartPtr (and friend doesn't work with template).</font>
00070 <font class="comment">// Provide incref()/decref() function doen't work since decref() can't do a delete this on a non virtual dtor.</font>
00071 <font class="comment">// So Ptr gestion can only be used via CSmartPtr.</font>
<a name="l00072"></a><a class="code" href="classNLMISC_1_1CRefCount.html#m0">00072</a> <font class="keyword">mutable</font> sint <a class="code" href="classNLMISC_1_1CRefCount.html#m0">crefs</a>; <font class="comment">// The ref counter for SmartPtr use.</font>
<a name="l00073"></a><a class="code" href="classNLMISC_1_1CRefCount.html#m1">00073</a> <font class="keyword">mutable</font> <a class="code" href="classNLMISC_1_1CRefCount.html#l0">CPtrInfo</a> *<a class="code" href="classNLMISC_1_1CRefCount.html#m1">pinfo</a>; <font class="comment">// The ref ptr for RefPtr use.</font>
00074
00076 <a class="code" href="classNLMISC_1_1CRefCount.html#a0">~CRefCount</a>();
<a name="l00078"></a><a class="code" href="classNLMISC_1_1CRefCount.html#a1">00078</a> <a class="code" href="classNLMISC_1_1CRefCount.html#a1">CRefCount</a>() { <a class="code" href="classNLMISC_1_1CRefCount.html#m0">crefs</a> = 0; pinfo=&NullPtrInfo; }
<a name="l00080"></a><a class="code" href="classNLMISC_1_1CRefCount.html#a2">00080</a> <a class="code" href="classNLMISC_1_1CRefCount.html#a1">CRefCount</a> &<a class="code" href="classNLMISC_1_1CRefCount.html#a2">operator=</a>(<font class="keyword">const</font> <a class="code" href="classNLMISC_1_1CRefCount.html#a1">CRefCount</a> &) {<font class="keywordflow">return</font> *<font class="keyword">this</font>;}
<a name="l00082"></a><a class="code" href="classNLMISC_1_1CRefCount.html#a3">00082</a> <a class="code" href="classNLMISC_1_1CRefCount.html#a1">CRefCount</a>(<font class="keyword">const</font> <a class="code" href="classNLMISC_1_1CRefCount.html#a1">CRefCount</a> &) {<a class="code" href="classNLMISC_1_1CRefCount.html#m0">crefs</a> = 0; pinfo=&NullPtrInfo;}
00083 };
00084
00085
00086
00087 <font class="comment">// ***************************************************************************</font>
00088 <font class="comment">// For debug only.</font>
<a name="l00089"></a><a class="code" href="smart__ptr_8h.html#a0">00089</a> <font class="preprocessor">#define SMART_TRACE(_s) ((void)0)</font>
<a name="l00090"></a><a class="code" href="smart__ptr_8h.html#a1">00090</a> <font class="preprocessor"></font><font class="preprocessor">#define REF_TRACE(_s) ((void)0)</font>
00091 <font class="preprocessor"></font><font class="comment">//#define SMART_TRACE(_s) printf("%s: %d \n", _s, Ptr?Ptr->crefs:0)</font>
00092 <font class="comment">//#define REF_TRACE(_s) printf("%s: %d \n", _s, pinfo!=&CRefCount::NullPtrInfo?pinfo->RefCount:0)</font>
00093
00094
00177 <font class="keyword">template</font> <<font class="keyword">class</font> T>
<a name="l00178"></a><a class="code" href="classNLMISC_1_1CSmartPtr.html">00178</a> <font class="keyword">class </font>CSmartPtr
00179 {
<a name="l00180"></a><a class="code" href="classNLMISC_1_1CSmartPtr.html#o0">00180</a> T* <a class="code" href="classNLMISC_1_1CSmartPtr.html#o0">Ptr</a>;
00181 <font class="keyword">public</font>:
00182
<a name="l00184"></a><a class="code" href="classNLMISC_1_1CSmartPtr.html#a0">00184</a> <a class="code" href="classNLMISC_1_1CSmartPtr.html#a0">CSmartPtr</a>() { <a class="code" href="classNLMISC_1_1CSmartPtr.html#o0">Ptr</a>=NULL; <a class="code" href="smart__ptr_8h.html#a0">SMART_TRACE</a>(<font class="stringliteral">"ctor()"</font>); }
<a name="l00186"></a><a class="code" href="classNLMISC_1_1CSmartPtr.html#a1">00186</a> <a class="code" href="classNLMISC_1_1CSmartPtr.html#a0">CSmartPtr</a>(T* p) { <a class="code" href="classNLMISC_1_1CSmartPtr.html#o0">Ptr</a>=p; <font class="keywordflow">if</font>(Ptr) <a class="code" href="classNLMISC_1_1CSmartPtr.html#o0">Ptr</a>->crefs++; <a class="code" href="smart__ptr_8h.html#a0">SMART_TRACE</a>(<font class="stringliteral">"ctor(T*)"</font>); }
<a name="l00188"></a><a class="code" href="classNLMISC_1_1CSmartPtr.html#a2">00188</a> <a class="code" href="classNLMISC_1_1CSmartPtr.html#a0">CSmartPtr</a>(<font class="keyword">const</font> <a class="code" href="classNLMISC_1_1CSmartPtr.html#a0">CSmartPtr</a> &copy) { <a class="code" href="classNLMISC_1_1CSmartPtr.html#o0">Ptr</a>=copy.Ptr; <font class="keywordflow">if</font>(Ptr) <a class="code" href="classNLMISC_1_1CSmartPtr.html#o0">Ptr</a>->crefs++; <a class="code" href="smart__ptr_8h.html#a0">SMART_TRACE</a>(<font class="stringliteral">"ctor(Copy)"</font>); }
00190 <a class="code" href="classNLMISC_1_1CSmartPtr.html#a3">~CSmartPtr</a>();
00191
00192
<a name="l00194"></a><a class="code" href="classNLMISC_1_1CSmartPtr.html#a4">00194</a> <a class="code" href="classNLMISC_1_1CSmartPtr.html#a4">operator T*</a>(<font class="keywordtype">void</font>)<font class="keyword"> const </font>{ <a class="code" href="smart__ptr_8h.html#a0">SMART_TRACE</a>(<font class="stringliteral">"castT*()"</font>); <font class="keywordflow">return</font> <a class="code" href="classNLMISC_1_1CSmartPtr.html#o0">Ptr</a>; }
<a name="l00196"></a><a class="code" href="classNLMISC_1_1CSmartPtr.html#a5">00196</a> T& <a class="code" href="classNLMISC_1_1CSmartPtr.html#a5">operator*</a>(<font class="keywordtype">void</font>)<font class="keyword"> const </font>{ <a class="code" href="smart__ptr_8h.html#a0">SMART_TRACE</a>(<font class="stringliteral">"ope*()"</font>); <font class="keywordflow">return</font> *<a class="code" href="classNLMISC_1_1CSmartPtr.html#o0">Ptr</a>; }
<a name="l00198"></a><a class="code" href="classNLMISC_1_1CSmartPtr.html#a6">00198</a> T* <a class="code" href="classNLMISC_1_1CSmartPtr.html#a6">operator-></a>(<font class="keywordtype">void</font>)<font class="keyword"> const </font>{ <a class="code" href="smart__ptr_8h.html#a0">SMART_TRACE</a>(<font class="stringliteral">"ope->()"</font>); <font class="keywordflow">return</font> <a class="code" href="classNLMISC_1_1CSmartPtr.html#o0">Ptr</a>; }
00199
00201 <a class="code" href="classNLMISC_1_1CSmartPtr.html#a0">CSmartPtr</a>& <a class="code" href="classNLMISC_1_1CSmartPtr.html#a7">operator=</a>(T* p);
00203 <a class="code" href="classNLMISC_1_1CSmartPtr.html#a0">CSmartPtr</a>& <a class="code" href="classNLMISC_1_1CSmartPtr.html#a7">operator=</a>(<font class="keyword">const</font> <a class="code" href="classNLMISC_1_1CSmartPtr.html#a0">CSmartPtr</a> &p);
00205 <font class="keywordtype">bool</font> <a class="code" href="classNLMISC_1_1CSmartPtr.html#a9">operator<</a>(<font class="keyword">const</font> <a class="code" href="classNLMISC_1_1CSmartPtr.html#a0">CSmartPtr</a> &p) <font class="keyword">const</font>;
00206
<a name="l00207"></a><a class="code" href="classNLMISC_1_1CSmartPtr.html#a10">00207</a> sint <a class="code" href="classNLMISC_1_1CSmartPtr.html#a10">getNbRef</a>() { <font class="keywordflow">if</font>(Ptr) <font class="keywordflow">return</font> <a class="code" href="classNLMISC_1_1CSmartPtr.html#o0">Ptr</a>->crefs; <font class="keywordflow">else</font> <font class="keywordflow">return</font> 0; }
00208 <font class="comment">// No need to do any operator==. Leave the work to cast operator T*(void).</font>
00209 };
00210
00211
00212
00213 <font class="comment">// ***************************************************************************</font>
00243 <font class="comment"></font><font class="keyword">template</font> <<font class="keyword">class</font> T>
<a name="l00244"></a><a class="code" href="classNLMISC_1_1CRefPtr.html">00244</a> <font class="keyword">class </font>CRefPtr
00245 {
00246 <font class="keyword">private</font>:
<a name="l00247"></a><a class="code" href="classNLMISC_1_1CRefPtr.html#o0">00247</a> CRefCount::CPtrInfo *<a class="code" href="classNLMISC_1_1CRefPtr.html#o0">pinfo</a>; <font class="comment">// A ptr to the handle of the object.</font>
<a name="l00248"></a><a class="code" href="classNLMISC_1_1CRefPtr.html#o1">00248</a> <font class="keyword">mutable</font> T *<a class="code" href="classNLMISC_1_1CRefPtr.html#o1">Ptr</a>; <font class="comment">// A cache for pinfo->Ptr. UseFull to speed up ope->() and ope*()</font>
00249
00250 <font class="keywordtype">void</font> <a class="code" href="classNLMISC_1_1CRefPtr.html#c0">unRef</a>() <font class="keyword">const</font>; <font class="comment">// Just release the handle pinfo, but do not update pinfo/Ptr, if deleted.</font>
00251
00252 <font class="keyword">public</font>:
00253
00255 <a class="code" href="classNLMISC_1_1CRefPtr.html#a0">CRefPtr</a>();
00257 <a class="code" href="classNLMISC_1_1CRefPtr.html#a0">CRefPtr</a>(T *<a class="code" href="driver__opengl__extension__def_8h.html#a368">v</a>);
00259 <a class="code" href="classNLMISC_1_1CRefPtr.html#a0">CRefPtr</a>(<font class="keyword">const</font> <a class="code" href="classNLMISC_1_1CRefPtr.html#a0">CRefPtr</a> &copy);
00261 <a class="code" href="classNLMISC_1_1CRefPtr.html#a3">~CRefPtr</a>(<font class="keywordtype">void</font>);
00262
00263
00265 <a class="code" href="classNLMISC_1_1CRefPtr.html#a4">operator T*</a>() <font class="keyword">const</font>;
00267 T& <a class="code" href="classNLMISC_1_1CRefPtr.html#a5">operator*</a>(<font class="keywordtype">void</font>) <font class="keyword">const</font>;
00269 T* <a class="code" href="classNLMISC_1_1CRefPtr.html#a6">operator-></a>(<font class="keywordtype">void</font>) <font class="keyword">const</font>;
00270
00271
00273 <a class="code" href="classNLMISC_1_1CRefPtr.html#a0">CRefPtr</a>& <a class="code" href="classNLMISC_1_1CRefPtr.html#a7">operator=</a>(T *<a class="code" href="driver__opengl__extension__def_8h.html#a368">v</a>);
00275 <a class="code" href="classNLMISC_1_1CRefPtr.html#a0">CRefPtr</a>& <a class="code" href="classNLMISC_1_1CRefPtr.html#a7">operator=</a>(<font class="keyword">const</font> <a class="code" href="classNLMISC_1_1CRefPtr.html#a0">CRefPtr</a> &copy);
00276
00277
00285 <font class="keywordtype">void</font> <a class="code" href="classNLMISC_1_1CRefPtr.html#a9">kill</a>();
00286
00287
00288 <font class="comment">// No need to do any operator==. Leave the work to cast operator T*(void).</font>
00289 };
00290
00291
00292
00293 }
00294
00295
00296 <font class="comment">// ***************************************************************************</font>
00297 <font class="comment">// ***************************************************************************</font>
00298 <font class="comment">// Implementation.</font>
00299 <font class="comment">// ***************************************************************************</font>
00300 <font class="comment">// ***************************************************************************</font>
00301
00302
00303 <font class="preprocessor">#include "<a class="code" href="smart__ptr__inline_8h.html">smart_ptr_inline.h</a>"</font>
00304 <font class="preprocessor">#undef SMART_TRACE</font>
00305 <font class="preprocessor"></font><font class="preprocessor">#undef REF_TRACE</font>
00306 <font class="preprocessor"></font>
00307
00308
00309 <font class="preprocessor">#endif // NL_SMART_PTR_H</font>
00310 <font class="preprocessor"></font>
00311 <font class="comment">/* End of smart_ptr.h */</font>
</pre></div>
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