50 lines
1.1 KiB
Rust
50 lines
1.1 KiB
Rust
|
//! An example of implementing Rust's standard formatting and parsing traits for flags types.
|
||
|
|
|
||
|
|
use core::{fmt, str};
|
||
|
|
|
||
|
|
bitflags::bitflags! {
|
||
|
|
// You can `#[derive]` the `Debug` trait, but implementing it manually
|
||
|
|
// can produce output like `A | B` instead of `Flags(A | B)`.
|
||
|
|
// #[derive(Debug)]
|
||
|
|
#[derive(PartialEq, Eq)]
|
||
|
|
pub struct Flags: u32 {
|
||
|
|
const A = 1;
|
||
|
|
const B = 2;
|
||
|
|
const C = 4;
|
||
|
|
const D = 8;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl fmt::Debug for Flags {
|
||
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||
|
|
bitflags::parser::to_writer(self, f)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl fmt::Display for Flags {
|
||
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||
|
|
bitflags::parser::to_writer(self, f)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl str::FromStr for Flags {
|
||
|
|
type Err = bitflags::parser::ParseError;
|
||
|
|
|
||
|
|
fn from_str(flags: &str) -> Result<Self, Self::Err> {
|
||
|
|
bitflags::parser::from_str(flags)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fn main() -> Result<(), bitflags::parser::ParseError> {
|
||
|
|
let flags = Flags::A | Flags::B;
|
||
|
|
|
||
|
|
println!("{}", flags);
|
||
|
|
|
||
|
|
let formatted = flags.to_string();
|
||
|
|
let parsed: Flags = formatted.parse()?;
|
||
|
|
|
||
|
|
assert_eq!(flags, parsed);
|
||
|
|
|
||
|
|
Ok(())
|
||
|
|
}
|