Re: Interfacing to C library...

[Robert A Duff <bobduff@shell01.TheWorld.com>]

"Eric G. Miller" <egm2@jps-nospam.net> writes:

> I'm working on building an interface to a C library where most of the
> functions are defined as returning a long integer containing the various
> error codes returned by each function and data is passed back from the
> "functions" via pointer arguments to [usually] structures.  Below is
> something of a demonstration of what I've come up with, but I'd appreciate
> pointers to better approaches.  Eventually, I'd like to hide the access
> type and handle the error codes another way (exceptions maybe...).

First write a "thin" interface, which is as close to the C code as
possible.  E.g., use a modular type for your error codes, as you did.

Then write another package that is "thicker", and takes advantage
of Ada features like exceptions.

- Bob