Mic*_*eod 5 racket typed-racket
我正在尝试在运行时从其他模块加载和使用功能。问题在于,dynamic-require范围Any似乎无法cast修改为更具体的(函数)类型。
test.rkt:
#lang typed/racket
(module other-module typed/racket
(provide f)
(: f : Integer -> Integer)
(define (f x)
(* x 2)))
; g has type Any because dynamic-require returns a value of type Any
(define g (dynamic-require '(submod "test.rkt" other-module) 'f))
;contract violation
; Attempted to use a higher-order value passed as `Any` in untyped code: #<procedure:f>
; in: Any
; contract from: typed-world
; blaming: cast
; (assuming the contract is correct)
((cast g (-> Integer Integer)) 3)
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有什么方法可以在运行时从in中的其他模块加载和使用函数#lang typed/racket吗?
一种解决方法是在无类型模块中进行加载并用于require/typed分配类型:
#lang typed/racket
(module other-module typed/racket
(provide f)
(: f : Integer -> Integer)
(define (f x)
(* x 2)))
(module another-module racket
(define g (dynamic-require '(submod "test.rkt" other-module) 'f))
(provide g))
(require/typed 'another-module
(g (-> Integer Integer)))
(g 3)
;; 6
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但是,是的,如果dynamic-require可以采用目标类型或类型化球拍允许非类型化区域(与 相反with-type),那就更好了。