gbeta gbeta is an interpreter of a generalized version of the BETA programming language. BETA is a modern, object-oriented language in the Scandinavian tradition. It delivers great expressive power using only few language constructs: a useful, simple, and clean language. It has a strong static typesystem and static name binding, general block-structure (nesting, true closures), virtual types, real type variables, expressive method combination, and a very flexible and expressive module and visibility control system. gbeta generalizes the BETA language in fundamental ways. Firstly, the type system is based on constraints (the type denoted by a declaration is the most general class satisfying the constraints). Secondly, object metamorphosis is supported (take an existing object, apply a class as a constraint, and the object dynamically specializes ("inherits") such that it becomes an instance of a derivation of that class). Thirdly, classes can be constructed at run-time (without sacrificing type correctness) and classes can be inherited from even if they are not known before run-time, such as with virtual classes or class variables.

Current Version:   0.8 License Type:   GPL

Home Site: href="http://www.daimi.aau.dk/~eernst/gbeta/index.html Source Code Availability:   Yes Available Binary Packages: Debian Package:   No RedHat RPM Package:   No Other Packages:   Yes (from Home Site) Targeted Platforms: Unix (Linux,Sun/Sparc,SGI/IRIX,HP-UX9,(Windows NT/95)) Software/Hardware Requirements: If you want to compile it yourself you need a BETA compiler.

Other Links: http://www.daimi.aau.dk/~beta/index.html (more about BETA) Mailing Lists/USENET News Groups: Mailing list beta@foxylady.physik.tu-berlin.de (discussions, bug-reports, proposals, whatever about both gbeta and b2c). comp.lang.beta User Comments: None See A Screen Shot?

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