How to create an empty() flagset?

[elmarco]

Hi

I might not have enough sleep:

#[repr(u32)]
#[derive(BitFlags, Debug, PartialEq, Copy, Clone)]
pub enum RequestNameFlags {
    AllowReplacement = 0x01,
    ReplaceExisting = 0x02,
    DoNotQueue = 0x04,
}

How to crate an empty flag set? I am looking for RequestNameFlags::empty(), but I can't find it.

Do I need to have an expicit 0 value in the enum?

[zeenix]

I don't think you create empty flags, you need to use the BitFlags struct.

[zeenix]

https://docs.rs/enumflags2/0.6.4/enumflags2/struct.BitFlags.html#method.empty

[meithecatte]

On Tue, Jun 16, 2020 at 02:16:52AM -0700, Marc-Andre Lureau wrote: Hi I might not have enough sleep: ```rust #[repr(u32)] #[derive(BitFlags, Debug, PartialEq, Copy, Clone)] pub enum RequestNameFlags { AllowReplacement = 0x01, ReplaceExisting = 0x02, DoNotQueue = 0x04, } ``` How to crate an empty flag set? I am looking for RequestNameFlags::empty(), but I can't find it. Do I need to have an expicit 0 value in the enum? -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: #25

You might be looking for `BitFlags::empty()`.

[elmarco]

Ok, got it. I had wrong assumptions about potential values of RequestNameFlags, it is actually BitFlags<RequestNameFlags> that can take various bitflags values.

BitFlags<RequestNameFlags>::emtpy() is a bit inconvenient. Can't the derive macro implement RequestNameFlags::empty() ?

[meithecatte]

Yeah, that's reasonable. In the meantime, note that you can often rely on type inference and just write BitFlags::empty(), sans turbofish.

[meithecatte]

Resolved by #28