Jeffrey Meunier has an implicit Curry macro here, which uses defmacro. I was wondering if someone has ever written this with syntax-rules?
Implicit currying in Scheme with syntax-rules?
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There are a number of curry implementations for Scheme -- none can be as elegant as Haskell, since there functions are always unary functions, so everything can be curried. (But this can of course be implemented in a sufficiently powerful Scheme like Racket.)
As for the macro that you've dug up -- it's a pretty bad one: not only does it use an unhygienic macro, it's also calling
eval
explicitly, and relies on an implementation of environments etc. But it's easy to do that with a simplesyntax-rules
macro. AFAICT, this is what it implements:But there's an important note here. The page that you reference says that an problem of the function version is that it's explicit -- but it also has an important advantage: with the macro implementation you must define a function using
clambda
, whereas the functional version can be used with any built in function. In many Scheme implementations there are facilities to inspect a function's arity, and using this it's possible to implement a currying function version that knows when to call the original function.