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<h1>tracing_example.cpp</h1>This code exemplifies how to insert trace statements to follow the flow of program execution. When compiler under gcc 3.3 and run, the following program will output the following trace: <div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 trace[1]: Entering <span class="keywordtype">int</span> main()
<a name="l00002"></a>00002 trace[2]: Entering <span class="keywordtype">int</span> foo(<span class="keywordtype">int</span>)
<a name="l00003"></a>00003 trace[3]: Entering <span class="keywordtype">int</span> Foo::bar(<span class="keywordtype">int</span>)
<a name="l00004"></a>00004 trace[3]: i = 21
<a name="l00005"></a>00005 trace[3]: At line 16 in tracing_example.cpp
<a name="l00006"></a>00006 trace[3]: Wrong answer
<a name="l00007"></a>00007 trace[3]: i = 42
<a name="l00008"></a>00008 trace[3]: Exiting <span class="keywordtype">int</span> Foo::bar(<span class="keywordtype">int</span>)
<a name="l00009"></a>00009 trace[3]: Entering <span class="keywordtype">int</span> Foo::bar(<span class="keywordtype">int</span>)
<a name="l00010"></a>00010 trace[3]: i = 42
<a name="l00011"></a>00011 trace[3]: At line 13 in tracing_example.cpp
<a name="l00012"></a>00012 trace[3]: Right answer, but no question
<a name="l00013"></a>00013 trace[3]: i = 42
<a name="l00014"></a>00014 trace[3]: Exiting <span class="keywordtype">int</span> Foo::bar(<span class="keywordtype">int</span>)
<a name="l00015"></a>00015 trace[2]: Exiting <span class="keywordtype">int</span> foo(<span class="keywordtype">int</span>)
<a name="l00016"></a>00016 trace[1]: Exiting <span class="keywordtype">int</span> main()
</pre></div> Of course, a word of warning must be added: adding so much tracing to your code might degrade its readability, at least until we devise an Emacs macro to hide trace statements with a couple of keystrokes.<p>
<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
<a name="l00002"></a>00002 <span class="preprocessor">#include <ql/quantlib.hpp></span>
<a name="l00003"></a>00003
<a name="l00004"></a>00004 <span class="keyword">using namespace </span>QuantLib;
<a name="l00005"></a>00005
<a name="l00006"></a>00006 <span class="keyword">namespace </span>Foo {
<a name="l00007"></a>00007
<a name="l00008"></a>00008 <span class="keywordtype">int</span> bar(<span class="keywordtype">int</span> i) {
<a name="l00009"></a>00009 <a name="a0"></a><a class="code" href="group__debug_macros.html#g903ea9f035842ee3560fd787c84887d7">QL_TRACE_ENTER_FUNCTION</a>;
<a name="l00010"></a>00010 <a name="a1"></a><a class="code" href="group__debug_macros.html#g7d82587448e3f5531f79cfb215b905af">QL_TRACE_VARIABLE</a>(i);
<a name="l00011"></a>00011
<a name="l00012"></a>00012 <span class="keywordflow">if</span> (i == 42) {
<a name="l00013"></a>00013 <a name="a2"></a><a class="code" href="group__debug_macros.html#g4b80d6b6b9d0d17493ac81428934f1c0">QL_TRACE_LOCATION</a>;
<a name="l00014"></a>00014 <a name="a3"></a><a class="code" href="group__debug_macros.html#g456b5371fdc64479d393a04b505df5d0">QL_TRACE</a>(<span class="stringliteral">"Right answer, but no question"</span>);
<a name="l00015"></a>00015 } <span class="keywordflow">else</span> {
<a name="l00016"></a>00016 <a class="code" href="group__debug_macros.html#g4b80d6b6b9d0d17493ac81428934f1c0">QL_TRACE_LOCATION</a>;
<a name="l00017"></a>00017 <a class="code" href="group__debug_macros.html#g456b5371fdc64479d393a04b505df5d0">QL_TRACE</a>(<span class="stringliteral">"Wrong answer"</span>);
<a name="l00018"></a>00018 i *= 2;
<a name="l00019"></a>00019 }
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <a class="code" href="group__debug_macros.html#g7d82587448e3f5531f79cfb215b905af">QL_TRACE_VARIABLE</a>(i);
<a name="l00022"></a>00022 <a name="a4"></a><a class="code" href="group__debug_macros.html#g33c013fea8c974f6781441deaa3ea53b">QL_TRACE_EXIT_FUNCTION</a>;
<a name="l00023"></a>00023 <span class="keywordflow">return</span> i;
<a name="l00024"></a>00024 }
<a name="l00025"></a>00025
<a name="l00026"></a>00026 }
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="keywordtype">int</span> foo(<span class="keywordtype">int</span> i) {
<a name="l00029"></a>00029 <span class="keyword">using namespace </span>Foo;
<a name="l00030"></a>00030 <a class="code" href="group__debug_macros.html#g903ea9f035842ee3560fd787c84887d7">QL_TRACE_ENTER_FUNCTION</a>;
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="keywordtype">int</span> j = bar(i);
<a name="l00033"></a>00033 <span class="keywordtype">int</span> k = bar(j);
<a name="l00034"></a>00034
<a name="l00035"></a>00035 <a class="code" href="group__debug_macros.html#g33c013fea8c974f6781441deaa3ea53b">QL_TRACE_EXIT_FUNCTION</a>;
<a name="l00036"></a>00036 <span class="keywordflow">return</span> k;
<a name="l00037"></a>00037 }
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="keywordtype">int</span> main() {
<a name="l00040"></a>00040
<a name="l00041"></a>00041 <a name="a5"></a><a class="code" href="group__debug_macros.html#g69b168aeab2ef4ff9033469b8214a279">QL_TRACE_ENABLE</a>;
<a name="l00042"></a>00042
<a name="l00043"></a>00043 <a class="code" href="group__debug_macros.html#g903ea9f035842ee3560fd787c84887d7">QL_TRACE_ENTER_FUNCTION</a>;
<a name="l00044"></a>00044
<a name="l00045"></a>00045 <span class="keywordtype">int</span> i = foo(21);
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <a class="code" href="group__debug_macros.html#g33c013fea8c974f6781441deaa3ea53b">QL_TRACE_EXIT_FUNCTION</a>;
<a name="l00048"></a>00048 <span class="keywordflow">return</span> 0;
<a name="l00049"></a>00049 }
<a name="l00050"></a>00050
</pre></div>
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