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<title>EO: SymImpl.cpp Source File</title>
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<a class="el" href="dir_000007.html">contrib</a> / <a class="el" href="dir_000008.html">mathsym</a> / <a class="el" href="dir_000028.html">sym</a></div>
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<h1>SymImpl.cpp</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 <span class="preprocessor">#include "Sym.h"</span>
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00018
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00019 <span class="keyword">using</span> <span class="keyword">namespace </span>std;
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00020 <span class="keyword">namespace </span>detail {
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00021
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00022 <span class="keyword">class </span>SymArgsImpl {
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00023 <span class="keyword">public</span>:
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00024 std::vector<Sym> owned_args;
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00025 };
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00026
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00027 size_t SymArgs::len()<span class="keyword"> const </span>{
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00028 <span class="keywordflow">return</span> vec().size();
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00029 }
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00030
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00031 SymArgs::SymArgs() : pimpl( new SymArgsImpl ) {
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00032 args_ptr = &pimpl->owned_args;
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00033 }
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00034
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00035 SymArgs::SymArgs(<span class="keyword">const</span> std::vector<Sym>& v) : pimpl(0) {
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00036 args_ptr = &v;
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00037 }
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00038
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00039 SymArgs::~SymArgs() {
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00040 <span class="keyword">delete</span> pimpl;
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00041 }
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00042
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00043 SymArgs::SymArgs(<span class="keyword">const</span> SymArgs& args) : pimpl(0), args_ptr(args.args_ptr) {
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00044 <span class="keywordflow">if</span> (args.pimpl && args.args_ptr == &args.pimpl->owned_args) {
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00045 pimpl = <span class="keyword">new</span> SymArgsImpl(*args.pimpl);
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00046 args_ptr = &pimpl->owned_args;
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00047 }
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00048 }
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00049
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00050 <span class="keyword">const</span> SymArgs& SymArgs::operator=(<span class="keyword">const</span> SymArgs& args) {
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00051 <span class="keywordflow">if</span> (args.pimpl && args.args_ptr == &args.pimpl->owned_args) {
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00052 pimpl = <span class="keyword">new</span> SymArgsImpl(*args.pimpl);
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00053 args_ptr = &pimpl->owned_args;
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00054 } <span class="keywordflow">else</span> {
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00055 args_ptr = args.args_ptr;
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00056 }
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00057
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00058 <span class="keywordflow">return</span> *<span class="keyword">this</span>;
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00059 }
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00060
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00061 <span class="keywordtype">void</span> SymArgs::fixate()<span class="keyword"> const </span>{
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00062 assert(pimpl == 0);
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00063 pimpl = <span class="keyword">new</span> SymArgsImpl;
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00064 pimpl->owned_args = *args_ptr;
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00065 args_ptr = &pimpl->owned_args;
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00066 }
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00067
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00068 <span class="comment">// For Tackett's hashcode</span>
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00069 <span class="preprocessor">#define PRIMET 21523</span>
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00070 <span class="preprocessor"></span><span class="preprocessor">#define HASHMOD 277218551</span>
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00071 <span class="preprocessor"></span>
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00072 <span class="keyword">const</span> <span class="keywordtype">int</span> nprimes = 4;
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00073 <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> primes[] = {3221225473ul, 201326611ul, 1610612741ul, 805306457ul};
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00074
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00075 <span class="keywordtype">int</span> SymKey::calc_hash()<span class="keyword"> const </span>{
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00076 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> hash = unsigned(token);
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00077 hash *= PRIMET;
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00078
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00079 <span class="keyword">const</span> std::vector<Sym>& v = args.vec();
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00080 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i < v.size(); ++i) {
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00081 hash += ( (v[i].address() >> 3) * primes[i%nprimes]) % HASHMOD;
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00082 }
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00083
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00084 <span class="keywordflow">return</span> hash;<span class="comment">// % HASHMOD;</span>
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00085 }
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00086
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00087 <span class="keywordtype">bool</span> SymKey::operator==(<span class="keyword">const</span> SymKey& other)<span class="keyword"> const </span>{
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00088 <span class="keywordflow">if</span> (token != other.token) <span class="keywordflow">return</span> <span class="keyword">false</span>;
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00089 <span class="keywordflow">return</span> args.vec() == other.args.vec();
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00090 }
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00091
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00092 <span class="comment">/* Just to store this info somewhere:</span>
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00093 <span class="comment"> * </span>
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00094 <span class="comment"> * Address Based Hash Function Implementation</span>
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00095 <span class="comment"> * uint32 address_hash(char* addr)</span>
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00096 <span class="comment"> * {</span>
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00097 <span class="comment"> * register uint32 key;</span>
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00098 <span class="comment"> * key = (uint32) addr;</span>
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00099 <span class="comment"> * return (key >> 3) * 2654435761;</span>
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00100 <span class="comment"> * }</span>
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00101 <span class="comment"> */</span>
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00102
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00103 SymValue::SymValue() : refcount(0), size(0), depth(0), uniqueNodeStats(0) {}
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00104
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00105 SymValue::~SymValue() { <span class="keyword">delete</span> uniqueNodeStats; }
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00106
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00107
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00108
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00109 } <span class="comment">// namespace detail</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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