You want to use the perlguts macros SvIOKp, SvNOKp, SvPOKp (test for internal representation as IV (integer), NV (double) or PV (string)). Here's Inline code to do it (you'll need to get the Inline module from CPAN):
package types;
use Inline C => <<'END_C';
int is_iv(SV *x) {
return SvIOKp(x) != 0;
}
int is_nv(SV *x) {
return SvNOKp(x) != 0;
}
int is_pv(SV *x) {
return SvPOKp(x) != 0;
}
END_C
1;
But I'm not sure I'd recommend doing this! Perl users expect to have all integers autostringified when needed. Also, I wouldn't try it on magic "double valued scalars" (which have different string and numeric values), like $!.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|