[columbus.pm] very basic embedding of perl into c++

[Colin Walters]

>>>>> "Ron" == Ron Grabowski <ronnie at catlover.com> writes:

    Ron> I want to embed a couple subroutines, call them, and send the
    Ron> returned string back to C. I have several subroutines so
    Ron> 'perl_eval_va()' isn't the best choice.

One of the first things you will learn when embedding Perl is that
perl is not very embedding-friendly :)

[code snipped]

    Ron> [...] But I want to capture the returned value as some sort
    Ron> of string...

Yes.  That's why you have to call the subroutine by hand.  See Chapter
20, "Calling a Perl Subroutine", page 352.

In particular, you have to use POPp to get the returned string from
the stack after calling perl_call_pv().

    Ron> When compiling it,

    Ron> % gcc -o ex -I/usr/local/lib/perl5/i586-linux/5.004/CORE \
    Ron> -L/usr/local/lib/perl5/i586-linux/5.004/CORE \ -Dbool=char
    Ron> -DHAS_BOOL \ ex.c -lperl -lm

    Ron> What are the '-Dbool=char' and '-DHAS_BOOL' flag?

If the perl source needs a boolean value, this tells it to use a
'char' type.  No big deal.
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