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Add `arity' enhancement news.

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Thien-Thi Nguyen 2001-09-09 01:09:24 +00:00
parent 2851e5bc70
commit 998bfc70f0
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@ -776,6 +776,32 @@ Note that the "5d" is dropped. Now it is like so:
This enables single-char options to have adjoining arguments as long as their This enables single-char options to have adjoining arguments as long as their
constituent characters are not potential single-char options. constituent characters are not potential single-char options.
** (ice-9 session) procedure `arity' now works with (ice-9 optargs) `lambda*'
The `lambda*' and derivative forms in (ice-9 optargs) now set a procedure
property `arglist', which can be retrieved by `arity'. The result is that
`arity' can give more detailed information than before:
Before:
guile> (use-modules (ice-9 optargs))
guile> (define* (foo #:optional a b c) a)
guile> (arity foo)
0 or more arguments in `lambda*:G0'.
After:
guile> (arity foo)
3 optional arguments: `a', `b' and `c'.
guile> (define* (bar a b #:key c d #:allow-other-keys) a)
guile> (arity bar)
2 required arguments: `a' and `b', 2 keyword arguments: `c'
and `d', other keywords allowed.
guile> (define* (baz a b #:optional c #:rest r) a)
guile> (arity baz)
2 required arguments: `a' and `b', 1 optional argument: `c',
the rest in `r'.
* Changes to the C interface * Changes to the C interface
** Types have been renamed from scm_*_t to scm_t_*. ** Types have been renamed from scm_*_t to scm_t_*.