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Mikael Djurfeldt 1999-09-19 14:35:53 +00:00
parent d4c83f63ff
commit daf516d661
1 changed files with 5 additions and 13 deletions
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18
NEWS
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@ -187,21 +187,12 @@ documentation slots are not yet used.
It is now possible to extend the functionality of some Guile
primitives by letting them defer a call to a GOOPS generic function on
argument mismatch. This functionality is enabled with the GOOPS
primitive
enable-primitive-generic! PRIMITIVE ...
[This primitive will disappear again in Guile-1.4 when all primitives
will be primitive generics.]
It is then possible to extend the primitive(s) by defining methods for
them without loss of efficiency in normal evaluation.
argument mismatch. This menas that there is no loss of efficiency in
normal evaluation.
Example:
(use-modules (oop goops))
(enable-primitive-generic! +)
(use-modules (oop goops)) ; Must be GOOPS version 0.2.
(define-method + ((x <string>) (y <string>))
(string-append x y))
@ -209,7 +200,8 @@ Example:
can also be used for concatenating strings.
Who will be the first one to extend Guile's numerical tower to
rationals? :)
rationals? :) [OK, there a few other things to fix before this can
be made in a clean way.]
*** New snarf macros for defining primitives: SCM_GPROC, SCM_GPROC1