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ePenguin-Software-Framework/toolchains/avr/doc/avr-libc/avr-libc-user-manual/group__avr__assert.html

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the monkey dances and laughs and sings and dances
4 years ago
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<td align="left"><a href="http://www.nongnu.org/avr-libc/"><h2>AVR Libc Home Page</h2></a></td>
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<h1>&lt;assert.h&gt;: Diagnostics</h1><table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Defines</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">#define&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__avr__assert.html#ga0041af519e0e7d47c9bcc83760c4669e">assert</a>(expression)</td></tr>
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<hr/><a name="_details"></a><h2>Detailed Description</h2>
<div class="fragment"><pre class="fragment"><span class="preprocessor"> #include &lt;<a class="code" href="assert_8h.html">assert.h</a>&gt;</span>
</pre></div><p>This header file defines a debugging aid.</p>
<p>As there is no standard error output stream available for many applications using this library, the generation of a printable error message is not enabled by default. These messages will only be generated if the application defines the macro</p>
<div class="fragment"><pre class="fragment"> __ASSERT_USE_STDERR
</pre></div><p>before including the <code>&lt;<a class="el" href="assert_8h.html">assert.h</a>&gt;</code> header file. By default, only <a class="el" href="group__avr__stdlib.html#ga63e28bec3592384b44606f011634c5a8">abort()</a> will be called to halt the application. </p>
<hr/><h2>Define Documentation</h2>
<a class="anchor" id="ga0041af519e0e7d47c9bcc83760c4669e"></a><!-- doxytag: member="assert.h::assert" ref="ga0041af519e0e7d47c9bcc83760c4669e" args="(expression)" -->
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<td class="memname">#define assert</td>
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<dl><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>expression</em>&nbsp;</td><td>Expression to test for.</td></tr>
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<p>The <a class="el" href="group__avr__assert.html#ga0041af519e0e7d47c9bcc83760c4669e">assert()</a> macro tests the given expression and if it is false, the calling process is terminated. A diagnostic message is written to stderr and the function <a class="el" href="group__avr__stdlib.html#ga63e28bec3592384b44606f011634c5a8">abort()</a> is called, effectively terminating the program.</p>
<p>If expression is true, the <a class="el" href="group__avr__assert.html#ga0041af519e0e7d47c9bcc83760c4669e">assert()</a> macro does nothing.</p>
<p>The <a class="el" href="group__avr__assert.html#ga0041af519e0e7d47c9bcc83760c4669e">assert()</a> macro may be removed at compile time by defining NDEBUG as a macro (e.g., by using the compiler option -DNDEBUG). </p>
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