Allow namespaced flags about bitflags HOT 5 CLOSED

Seems like this is not possible until the associated_consts feature is done and allowed in stable rust. Looking forward to that!

from bitflags.

Will namespaced constants using associated consts allow us to pattern match exhaustively on the flag names?

from bitflags.

In the interim, wrapping the whole definition in a mod at least gets you a namespace. E.g.:

pub mod xmp_packet_fmt {
    bitflags! {
        pub flags GExiv2XmpFormatFlags: u64 {
            const OMIT_PACKET_WRAPPER   = 0x0010,
            const READ_ONLY_PACKET      = 0x0020,
            const USE_COMPACT_FORMAT    = 0x0040,
            const INCLUDE_THUMBNAIL_PAD = 0x0100,
            const EXACT_PACKET_LENGTH   = 0x0200,
            const WRITE_ALIAS_COMMENTS  = 0x0400,
            const OMIT_ALL_FORMATTING   = 0x0800,
        }
    }
}

println!("{:?}", xmp_packet_fmt::INCLUDE_THUMBNAIL_PAD);

from bitflags.

Will namespaced constants using associated consts allow us to pattern match exhaustively on the flag names?

No I don't think so.

from bitflags.

It seems pretty clear at this point that associated constants are the answer to this, so let's track namespacing as part of #21.

from bitflags.