- 498 名前：名無しさん♯ mailto:sage [2007/07/28(土) 08:01:14 ]
- 作ってみた。
#light
type OptionBuilder () =
member o.Return x = Some x
member o.Bind (v, f) =
match v with
Some x -> f x
| _ -> None
member o.Let (x, f) = f x
let option = OptionBuilder ()
let _ =
option
{ let x = 100
let! y = None
return (x * y) }
|> print_any; print_newline ()
(実行結果)
None
