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realloc [C++ Reference]
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<h2><a name="realloc" id="realloc">realloc</a></h2>
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<p>
Syntax:
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<pre class="c code c++" style="font-family:monospace;"> <span class="co2">#include <cstdlib></span>
<span class="kw4">void</span> <span class="sy0">*</span>realloc<span class="br0">(</span> <span class="kw4">void</span> <span class="sy0">*</span>ptr<span class="sy0">,</span> size_t size <span class="br0">)</span><span class="sy0">;</span></pre>
<p>
The realloc() function changes the size of the object pointed to by ptr to the
given size. size can be any size, larger or smaller than the original. The
return value is a pointer to the new space, or NULL if there is an error. On
failure the original memory block is not freed or moved.
If ptr is NULL, realloc() acts just like malloc, creating a new memory space
and returning the pointer to that new location.
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Related Topics: <a href="../../c/mem/calloc.html" class="wikilink1" title="c:mem:calloc">calloc</a>, <a href="../../c/mem/free.html" class="wikilink1" title="c:mem:free">free</a>, <a href="../../c/mem/malloc.html" class="wikilink1" title="c:mem:malloc">malloc</a>
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