Is possible to define same-named operator for different argument count?

问题

Is possible to define same-named operator for different argument count?

And if it is possible then how?

for example I want:

let (-) x y = x - y
let (-) x  = -x

Sadly I can't call just -x, I need (-)x to use it but it's yet another sub-question which have no relation with primary question.

回答1:

This is not possible with let bindings

From MSDN

You can redefine the regular arithmetic operators in this manner because the scoping rules for F# dictate that newly defined operators take precedence over the built-in operators.

However, you can use the static member (+) versions with overloading (Same MSDN page)

In particular, this works:

> type t() =                   
-  static member (+) (a, b) = 1
-  static member (+) a = 5;;   

来源：https://stackoverflow.com/questions/14929470/is-possible-to-define-same-named-operator-for-different-argument-count