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<h3 class="subtitle">A free/open-source library for quantitative finance</h3>
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<div class="title">tracing_example.cpp</div> </div>
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<p>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: </p>
<div class="fragment"><pre class="fragment"> trace[1]: Entering <span class="keywordtype">int</span> main()
trace[2]: Entering <span class="keywordtype">int</span> foo(<span class="keywordtype">int</span>)
trace[3]: Entering <span class="keywordtype">int</span> Foo::bar(<span class="keywordtype">int</span>)
trace[3]: i = 21
trace[3]: At line 16 in tracing_example.cpp
trace[3]: Wrong answer
trace[3]: i = 42
trace[3]: Exiting <span class="keywordtype">int</span> Foo::bar(<span class="keywordtype">int</span>)
trace[3]: Entering <span class="keywordtype">int</span> Foo::bar(<span class="keywordtype">int</span>)
trace[3]: i = 42
trace[3]: At line 13 in tracing_example.cpp
trace[3]: Right answer, but no question
trace[3]: i = 42
trace[3]: Exiting <span class="keywordtype">int</span> Foo::bar(<span class="keywordtype">int</span>)
trace[2]: Exiting <span class="keywordtype">int</span> foo(<span class="keywordtype">int</span>)
trace[1]: Exiting <span class="keywordtype">int</span> main()
</pre></div><p> 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">
<span class="preprocessor">#include <ql/quantlib.hpp></span>
<span class="keyword">using namespace </span>QuantLib;
<span class="keyword">namespace </span>Foo {
<span class="keywordtype">int</span> bar(<span class="keywordtype">int</span> i) {
<a name="a0"></a><a class="code" href="group__debug_macros.html#ga903ea9f035842ee3560fd787c84887d7" title="output tracing information">QL_TRACE_ENTER_FUNCTION</a>;
<a name="a1"></a><a class="code" href="group__debug_macros.html#ga7d82587448e3f5531f79cfb215b905af" title="output tracing information">QL_TRACE_VARIABLE</a>(i);
<span class="keywordflow">if</span> (i == 42) {
<a name="a2"></a><a class="code" href="group__debug_macros.html#ga4b80d6b6b9d0d17493ac81428934f1c0" title="output tracing information">QL_TRACE_LOCATION</a>;
<a name="a3"></a><a class="code" href="group__debug_macros.html#ga456b5371fdc64479d393a04b505df5d0" title="output tracing information">QL_TRACE</a>(<span class="stringliteral">"Right answer, but no question"</span>);
} <span class="keywordflow">else</span> {
<a class="code" href="group__debug_macros.html#ga4b80d6b6b9d0d17493ac81428934f1c0" title="output tracing information">QL_TRACE_LOCATION</a>;
<a class="code" href="group__debug_macros.html#ga456b5371fdc64479d393a04b505df5d0" title="output tracing information">QL_TRACE</a>(<span class="stringliteral">"Wrong answer"</span>);
i *= 2;
}
<a class="code" href="group__debug_macros.html#ga7d82587448e3f5531f79cfb215b905af" title="output tracing information">QL_TRACE_VARIABLE</a>(i);
<a name="a4"></a><a class="code" href="group__debug_macros.html#ga33c013fea8c974f6781441deaa3ea53b" title="output tracing information">QL_TRACE_EXIT_FUNCTION</a>;
<span class="keywordflow">return</span> i;
}
}
<span class="keywordtype">int</span> foo(<span class="keywordtype">int</span> i) {
<span class="keyword">using namespace </span>Foo;
<a class="code" href="group__debug_macros.html#ga903ea9f035842ee3560fd787c84887d7" title="output tracing information">QL_TRACE_ENTER_FUNCTION</a>;
<span class="keywordtype">int</span> j = bar(i);
<span class="keywordtype">int</span> k = bar(j);
<a class="code" href="group__debug_macros.html#ga33c013fea8c974f6781441deaa3ea53b" title="output tracing information">QL_TRACE_EXIT_FUNCTION</a>;
<span class="keywordflow">return</span> k;
}
<span class="keywordtype">int</span> main() {
<a name="a5"></a><a class="code" href="group__debug_macros.html#ga69b168aeab2ef4ff9033469b8214a279" title="enable tracing">QL_TRACE_ENABLE</a>;
<a class="code" href="group__debug_macros.html#ga903ea9f035842ee3560fd787c84887d7" title="output tracing information">QL_TRACE_ENTER_FUNCTION</a>;
<span class="keywordtype">int</span> i = foo(21);
<a class="code" href="group__debug_macros.html#ga33c013fea8c974f6781441deaa3ea53b" title="output tracing information">QL_TRACE_EXIT_FUNCTION</a>;
<span class="keywordflow">return</span> 0;
}
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