F#位标志枚举 [英] F# bit flags enum

问题描述

我想在F#中创建一个bitflags枚举，使用位移位运算符以提高可读性:例如

I would like to create a bitflags enum in F#, using bitshift operators for readability: e.g.

[<Flags>]
type DaysOfWeek =
    | Monday = 1 <<< 0
    | Tuesday = 1 <<< 1
    | Wednesday = 1 <<< 2
    | Thursday = 1 <<< 3
    | Friday = 1 <<< 4
    | Saturday = 1 <<< 5
    | Sunday = 1 <<< 6

但是，F#编译器对此不满意.它说成员定义中的意外的中缀运算符".

However, the F# compiler dislikes this. It says "unexpected infix operator in member definition".

相对于2的手动幂，我更喜欢这种方法.有办法说服编译器我不是邪恶的人吗?

I would prefer this approach over manual powers of two. Is there a way to convince the compiler that I'm not being evil?

推荐答案

这不是您所要求的，但是您可以使用0b前缀来编写二进制正写，例如:

It's not exactly what you asked for, but you can write the binary longhand using the 0b prefix, eg:

[<Flags>]
type DaysOfWeek =
    | Monday    = 0b0000001
    | Tuesday   = 0b0000010
    | Wednesday = 0b0000100
    | Thursday  = 0b0001000
    | Friday    = 0b0010000
    | Saturday  = 0b0100000
    | Sunday    = 0b1000000

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