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    <p>This way you always know what the size is, because a specific type is dedicated to sizes. The very own question shows that it can be an issue: is it an <code>int</code> or an <code>unsigned int</code>? Also, what is the magnitude (<code>short</code>, <code>int</code>, <code>long</code>, etc.)?</p> <p>Because there is a specific type assigned, you don't have to worry about the length or the signed-ness.</p> <p>The actual definition can be found in the <a href="http://www.cplusplus.com/reference/clibrary/cstring/size_t/" rel="nofollow noreferrer">C++ Reference Library</a>, which says:</p> <blockquote> <p>Type: <code>size_t</code> (Unsigned integral type)</p> <p>Header: <code>&lt;cstring&gt;</code></p> <p><code>size_t</code> corresponds to the integral data type returned by the language operator <code>sizeof</code> and is defined in the <code>&lt;cstring&gt;</code> header file (among others) as an unsigned integral type.</p> <p>In <code>&lt;cstring&gt;</code>, it is used as the type of the parameter <code>num</code> in the functions <code>memchr</code>, <code>memcmp</code>, <code>memcpy</code>, <code>memmove</code>, <code>memset</code>, <code>strncat</code>, <code>strncmp</code>, <code>strncpy</code> and <code>strxfrm</code>, which in all cases it is used to specify the maximum number of bytes or characters the function has to affect.</p> <p>It is also used as the return type for <code>strcspn</code>, <code>strlen</code>, <code>strspn</code> and <code>strxfrm</code> to return sizes and lengths.</p> </blockquote>
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