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We currently are using a fake bitflags 2, derived from bitflags 1. More and more crates are using it, and we're at a sweet spot where flipping things around makes sense: using a fake bitflags 1, derived from bitflags 2. Differential Revision: https://phabricator.services.mozilla.com/D189316
23 lines
644 B
Rust
23 lines
644 B
Rust
//! An example of implementing the `BitFlags` trait manually for a flags type.
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use std::str;
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use bitflags::bitflags;
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// Define a flags type outside of the `bitflags` macro as a newtype
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// It can accept custom derives for libaries `bitflags` doesn't support natively
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#[derive(zerocopy::AsBytes, zerocopy::FromBytes)]
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#[repr(transparent)]
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pub struct ManualFlags(u32);
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// Next: use `impl Flags` instead of `struct Flags`
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bitflags! {
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impl ManualFlags: u32 {
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const A = 0b00000001;
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const B = 0b00000010;
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const C = 0b00000100;
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const ABC = Self::A.bits() | Self::B.bits() | Self::C.bits();
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}
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}
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fn main() {}
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