What about the following: 
CODE:
  if ( MY_SV_IS( ST(0), 'MyList' )) {
    THIS->count_Items_in( MY_CAST_SV( ST(0), 'MyList' )
  } elsif (MY_SV_IS( ST(0), 'MyHash' )) {
    THIS->count_Items_in( MY_CAST_SV( ST(0), 'MyHash' )
  }

[download]

This way, you don't have a plethora of macros. Remember, a preprocessor macro is just a direct text substitution. So, you can put text in there, kinda like what I was doing in my first reply.

------
We are the carpenters and bricklayers of the Information Age.

Then there are Damian modules.... *sigh* ... that's not about being less-lazy -- that's about being on some really good drugs -- you know, there is no spoon. - flyingmoose

I shouldn't have to say this, but any code, unless otherwise stated, is untested

In reply to Re^3: Terrible Trouble With Typemaps (XS Question) by dragonchild
in thread Terrible Trouble With Typemaps (XS Question) by Molt

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.