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<h1>shared_ptr.h</h1><div class="fragment"><pre class="fragment">00001 <span class="comment">/* </span>
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00002 <span class="comment"> * Copyright (C) 2005 Maarten Keijzer</span>
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00003 <span class="comment"> *</span>
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00004 <span class="comment"> * This program is free software; you can redistribute it and/or modify</span>
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00005 <span class="comment"> * it under the terms of version 2 of the GNU General Public License as </span>
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00006 <span class="comment"> * published by the Free Software Foundation. </span>
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00007 <span class="comment"> *</span>
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00008 <span class="comment"> * This program is distributed in the hope that it will be useful,</span>
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00009 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
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00010 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
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00011 <span class="comment"> * GNU General Public License for more details.</span>
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00012 <span class="comment"> *</span>
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00013 <span class="comment"> * You should have received a copy of the GNU General Public License</span>
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00014 <span class="comment"> * along with this program; if not, write to the Free Software</span>
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00015 <span class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span>
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00016 <span class="comment"> */</span>
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00017
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00018 <span class="preprocessor">#ifndef _SHARED_PTR_H</span>
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00019 <span class="preprocessor"></span><span class="preprocessor">#define _SHARED_PTR_H</span>
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00020 <span class="preprocessor"></span>
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00021
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00022 <span class="keyword">template</span> <<span class="keyword">class</span> T> <span class="keyword">class </span>weak_ptr;
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00023
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00024 <span class="keyword">template</span> <<span class="keyword">class</span> T>
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00025 <span class="keyword">class </span>shared_ptr {
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00026 <span class="keyword">private</span>:
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00027 T* ptr;
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00028 <span class="keywordtype">unsigned</span>* count; <span class="comment">//</span>
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00029
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00030 <span class="comment">/* special case, null pointer (nil-code) */</span>
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00031 <span class="keyword">static</span> <span class="keywordtype">unsigned</span>* nil() { <span class="keyword">static</span> <span class="keywordtype">unsigned</span> nil_counter(1); <span class="keywordflow">return</span> &nil_counter; }
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00032
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00033 <span class="keywordtype">void</span> decref() { <span class="keywordflow">if</span> (--(*count) == 0) { <span class="keyword">delete</span> ptr; <span class="keyword">delete</span> count; }}
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00034 <span class="keywordtype">void</span> incref() { ++(*count); }
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00035
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00036 <span class="keyword">friend</span> <span class="keyword">class </span>weak_ptr<T>;
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00037
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00038 <span class="keyword">public</span>:
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00039
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00040 shared_ptr() : ptr(0), count(nil()) { incref(); }
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00041 ~shared_ptr() { decref(); }
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00042
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00043 shared_ptr(<span class="keyword">const</span> shared_ptr<T>& o) : ptr(o.ptr), count(o.count) { incref(); }
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00044 shared_ptr(T* p) : ptr(p), count(new unsigned(1)) {}
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00045 <span class="keyword">explicit</span> shared_ptr(<span class="keyword">const</span> weak_ptr<T>& w) : ptr(w.ptr), count(w.count) { incref(); }
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00046
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00047 shared_ptr<T>& operator=(<span class="keyword">const</span> shared_ptr<T>& o) {
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00048 <span class="keywordflow">if</span> (ptr == o.ptr) <span class="keywordflow">return</span> *<span class="keyword">this</span>;
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00049 decref();
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00050 ptr = o.ptr;
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00051 count = o.count;
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00052 incref();
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00053 <span class="keywordflow">return</span> *<span class="keyword">this</span>;
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00054 }
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00055
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00056 T* get() { <span class="keywordflow">return</span> ptr; }
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00057 T* operator->() { <span class="keywordflow">return</span> ptr; }
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00058 T& operator*() { <span class="keywordflow">return</span> *ptr; }
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00059
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00060 <span class="keyword">const</span> T* get()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> ptr; }
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00061 <span class="keyword">const</span> T* operator->()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> ptr; }
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00062 <span class="keyword">const</span> T& operator*()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *ptr; }
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00063
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00064 <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> shared_ptr<T>& o)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> ptr == o.ptr; }
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00065 <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> shared_ptr<T>& o)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> ptr != o.ptr; }
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00066 <span class="keywordtype">bool</span> operator<(const shared_ptr<T>& o) <span class="keyword">const</span> { <span class="keywordflow">return</span> ptr < o.ptr; }
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00067
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00068 <span class="keywordtype">unsigned</span> refcount()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *count; }
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00069 };
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00070
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00071 <span class="keyword">template</span> <<span class="keyword">class</span> T>
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00072 <span class="keyword">class </span>weak_ptr {
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00073 T* ptr;
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00074 <span class="keywordtype">unsigned</span>* count;
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00075
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00076 <span class="keyword">friend</span> <span class="keyword">class </span>shared_ptr<T>;
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00077
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00078 <span class="keyword">public</span>:
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00079
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00080 weak_ptr() : ptr(0), count(shared_ptr<T>::nil()) {}
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00081 <span class="keyword">explicit</span> weak_ptr( <span class="keyword">const</span> shared_ptr<T>& s) : ptr(s.ptr), count(s.count) {}
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00082
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00083 shared_ptr<T> lock()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> shared_ptr<T>(*this); }
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00084
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00085
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00086 T* get() { <span class="keywordflow">return</span> ptr; }
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00087 T* operator->() { <span class="keywordflow">return</span> ptr; }
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00088 T& operator*() { <span class="keywordflow">return</span> *ptr; }
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00089
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00090 <span class="keyword">const</span> T* get()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> ptr; }
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00091 <span class="keyword">const</span> T* operator->()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> ptr; }
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00092 <span class="keyword">const</span> T& operator*()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *ptr; }
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00093
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00094 <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> shared_ptr<T>& o)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> ptr == o.ptr; }
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00095 <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> shared_ptr<T>& o)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> ptr != o.ptr; }
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00096 <span class="keywordtype">bool</span> operator<(const shared_ptr<T>& o) <span class="keyword">const</span> { <span class="keywordflow">return</span> ptr < o.ptr; }
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00097
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00098 <span class="keywordtype">unsigned</span> refcount()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> *count; }
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00099
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00100 };
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00101
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00102 <span class="preprocessor">#endif</span>
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</pre></div><hr size="1"><address style="align: right;"><small>Generated on Thu Oct 19 05:06:42 2006 for EO by
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<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.3.9.1 </small></address>
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