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In Digest #123 William Clinger <email@example.com> writes:
> Neither EVAL nor THE-ENVIRONMENT are part of Scheme, so the fact that XScheme
> happens to define procedures with those names that happen not to work the way
> someone expects has no bearing on whether it is a real Scheme system.
> Most people think it is better to think of incremental definitions as part
> of a programming environment instead of a language, since they are primarily
> used for debugging. The programming environment obviously differs from one
> implementation to another, so code that depends on the programming environment
> is not portable.
Is it possible to design an object-oriented layer which implements the
concepts of classes, inheritance and polymorphism in pure Scheme? Something
like Scoops seems to be impossible to build without functions like EVAL and
THE-ENVIRONMENT. In the case of Scoops incremental definitons are used for
much more than debugging. What could I do if I would like to make Scoops
portable? Am I completely missing the point?
Gerhard Eckel, firstname.lastname@example.org