I am currently writing my first XS-module (just a wrapper around the C math-library) with ok-ish success. The biggest issue is the documentation that is quite hard to understand and/or is incomplete.

I have successfully written a constructor in XS and implemented some functions out of the library as method calls. That works fine.

Now I want to implement a procedural interface, too. For this reason I need to know if its a method call or not. If its a method call the number to compute with the function is stored in the instance, if its a procedural call to a function its a number given as the first argument. This is the current code for the cosine-function:

double
cos(...)
    CODE:
        SV *arg = newSVsv(ST(0));
        if (sv_isobject(arg)) {
            HV *self_hv = MUTABLE_HV(SvRV(arg));
            SV **callback_ptr = hv_fetchs(self_hv, "Number", 0);
            SV *zahl = *callback_ptr;
        }
        else {
            SV *zahl = newSVsv(arg);
        }

        double x = SvNV(zahl);
        RETVAL = cos(x);
    OUTPUT:
        RETVAL

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Thanks in advance!

In reply to Procedural and object oriented interface in Perl/XS by stewa02

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