Tim Meehan <btmee...@gmail.com> writes: > I wanted to store a thunk in a hashtable so that I could look up its key > and then run it later. Something like this: > > #! /usr/bin/guile > !# > > (use-modules (ice-9 hash-table)) > > (define stuff (alist->hash-table > '((a . (lambda () (display "event a\n"))) > (b . (lambda () (display "event b\n"))) > (c . (lambda () (display "event c\n")))))) > > (define res (hash-ref stuff 'a)) > (res) > > But when I run it: > Wrong type to apply: (lambda () (display "event a\n"))
The lambda bit you've written is quoted. So you're asking Guile to apply
a list where the first element is the symbol 'lambda, the second is the
empty list, ...
You probably want something like this, where you're creating a list of
pairs, where the car of the pair is a symbol, and the cdr is a procedure
(rather than a list).
(define stuff (alist->hash-table
`((a . ,(lambda () (display "event a\n")))
(b . ,(lambda () (display "event b\n")))
(c . ,(lambda () (display "event c\n"))))))
Does that make sense?
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