Use-defined guard (was: RE: Enhanced type guard syntax])

Sean Hinde sean.hinde@REDACTED
Mon Sep 22 10:40:46 CEST 2003

On Monday, September 22, 2003, at 06:21  am, Richard A. O'Keefe wrote:

> "Fredrik Linder" <fredrik.linder@REDACTED>	However, by allowing 
> only a limited set of operations in guard-declared
> 	functions (such as only allowing then to call other guard-functions) 
> could
> 	be the fine line that increases usability while still preserving the
> 	consistency of the program.
> 	The usage I am targeting is to have user-defined guards as
> 	inspectors/selectors on ADTs.
> Except for the unnecessarily ugly syntax and not being quite as fully
> worked out, how is this different from my old "Abstract Patterns" 
> proposal?

I can't seem to find this proposal online. Link anyone?


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