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17 lines
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Chapter 8. Exception safety</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.1"><link rel="home" href="index.html" title="Cppcheck 1.44"><link rel="up" href="index.html" title="Cppcheck 1.44"><link rel="prev" href="ch07.html" title="Chapter 7. Leaks"><link rel="next" href="ch09.html" title="Chapter 9. html report"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 8. Exception safety</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch07.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="ch09.html">Next</a></td></tr></table><hr></div><div class="chapter" title="Chapter 8. Exception safety"><div class="titlepage"><div><div><h2 class="title"><a name="id2587519"></a>Chapter 8. Exception safety</h2></div></div></div><p>Cppcheck has a few checks that ensure that you don't break the basic
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guarantee of exception safety. It doesn't have any checks for the strong
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guarantee yet.</p><p>Example:</p><pre class="programlisting">Fred::Fred() : a(new int[20]), b(new int[20])
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{
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}</pre><p>By default cppcheck will not detect any problems in that
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code.</p><p>To enable the exception safety checking you can use
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<code class="literal">--enable</code>:</p><pre class="programlisting">cppcheck --enable=exceptNew --enable=exceptRealloc fred.cpp</pre><p>The output will be:</p><pre class="programlisting">[fred.cpp:3]: (style) Upon exception there is memory leak: a</pre><p>If an exception occurs when <code class="literal">b</code> is allocated,
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<code class="literal">a</code> will leak.</p><p>Here is another example:</p><pre class="programlisting">int *p;
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int a(int sz)
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{
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delete [] p;
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if (sz <= 0)
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throw std::runtime_error("size <= 0");
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p = new int[sz];
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}</pre><p>Check that with Cppcheck:</p><pre class="programlisting">cppcheck --enable=exceptNew --enable=exceptRealloc except2.cpp</pre><p>The output from Cppcheck is:</p><pre class="programlisting">[except2.cpp:7]: (error) Throwing exception in invalid state, p points at deallocated memory</pre></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch07.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="ch09.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 7. Leaks </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 9. html report</td></tr></table></div></body></html>
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