functions which return enumerate types

[John Steele Scott]

I have used g-wrap to wrap a function which returns an enumerate type. I
wanted to test the return value like so:

   (let ((status (cairo-status cr)))
     (if (not (eqv?  status 'success))
         (print-cairo-error status)
         (display "OK\n")))

This does not work correctly, because cairo-status is returning the
integer value (i.e. 0), rather than the symbol (i.e. 'success).

Is this a bug?

>From looking at the C code generated by g-wrap, I discovered that there
is a generated function which will convert from the integer
value to the enumeration symbol, which allows a simple workaround:

   (let ((status (enum-cairo-status-val->sym (cairo-status cr) #f)))
     (if (not (eqv?  status 'success))
         (print-cairo-error status)
         (display "OK\n")))

So that's doable, but it means I need to add an extra layer of wrapping to
cairo-status to get the effect I want.

By the way, what is the second argument to enum-*-val->sym for? I first
assumed that it was for decoding bitset enums, but after some basic
experimentation, this doesn't seem to be the case.

cheers,

John