Derive Macro modular_bitfield::BitfieldSpecifier

#[derive(BitfieldSpecifier)]
{
    // Attributes available to this derive:
    #[bits]
}

Derive macro for enums.

Generates code for enums to make them usable within #[bitfield] structs. Performs compile-time checks to validate that the enum is usable as bitfield specifier.

Example

use modular_bitfield::prelude::*;

#[bitfield]
struct Example {
    a: bool, // Uses 1 bit
    b: Mode, // Has 4 variants => uses 2 bits
    c: B5,   // Uses 5 bits
    d: B24,  // Uses 24 bits
}

#[derive(BitfieldSpecifier, Debug, PartialEq, Eq)]
pub enum Mode {
    Sleep,
    Awake,
    Working,
    Lazy,
}

let mut example = Example::new();
assert_eq!(example.a(), false); // `false as u8` is 0
assert_eq!(example.b(), Mode::Sleep);
example.set_a(true);
example.set_b(Mode::Awake);
assert_eq!(example.a(), true); // `true as u8` is 1
assert_eq!(example.b(), Mode::Awake);