File: custom_derive.rs

package info (click to toggle)
rustc 1.85.0%2Bdfsg3-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental, sid, trixie
  • size: 893,396 kB
  • sloc: xml: 158,127; python: 35,830; javascript: 19,497; cpp: 19,002; sh: 17,245; ansic: 13,127; asm: 4,376; makefile: 1,051; perl: 29; lisp: 29; ruby: 19; sql: 11
file content (23 lines) | stat: -rw-r--r-- 667 bytes parent folder | download | duplicates (4)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
//! An example of implementing the `BitFlags` trait manually for a flags type.

use std::str;

use bitflags::bitflags;

// Define a flags type outside of the `bitflags` macro as a newtype
// It can accept custom derives for libraries `bitflags` doesn't support natively
#[derive(zerocopy::AsBytes, zerocopy::FromBytes, zerocopy::FromZeroes)]
#[repr(transparent)]
pub struct ManualFlags(u32);

// Next: use `impl Flags` instead of `struct Flags`
bitflags! {
    impl ManualFlags: u32 {
        const A = 0b00000001;
        const B = 0b00000010;
        const C = 0b00000100;
        const ABC = Self::A.bits() | Self::B.bits() | Self::C.bits();
    }
}

fn main() {}