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Matthew Butterick 9 years ago
parent 1289992494
commit 45a0811230
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day7.rkt
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@ -81,7 +81,7 @@ One gotcha when using syntax transformers is that identifiers introduced by a tr
We also need to implement our 16-bit math operations. As we saw above, our syntax transformers are generating code that looks like, for instance, @racket[(RSHIFT (evaluate-arg bn) (evaluate-arg 2))]. This code won't work unless we've defined an @racket[RSHIFT] function too. We also need to implement our 16-bit math operations. As we saw above, our syntax transformers are generating code that looks like, for instance, @racket[(RSHIFT (evaluate-arg bn) (evaluate-arg 2))]. This code won't work unless we've defined an @racket[RSHIFT] function too.
These next definitions use @racket[define-syntax-rule] as a shortcut, which is another syntax transformer. These next definitions use @racket[define-syntax-rule] as a shortcut, which is another syntax transformer. (Thanks to @link["https://jeapostrophe.github.io"]{Jay McCarthy} for the 16-bit operations.)
@chunk[<day7-ops> @chunk[<day7-ops>