de &#60;pcre2.h&#62;</b>
</P>
<P>
<b>int pcre2_set_callout(pcre2_match_context *<i>mcontext</i>,</b>
<b>  int (*<i>callout_function</i>)(pcre2_callout_block *),</b>
<b>  void *<i>callout_data</i>);</b>
</P>
<br><b>
DESCRIPTION
</b><br>
<P>
This function sets the callout fields in a match context (the first argument).
The second argument specifies a callout function, and the third argument is an
opaque data time that is passed to it. The result of this function is always
zero.
</P>
<P>
There is a complete de