bitflags ======== [![Rust](https://github.com/bitflags/bitflags/workflows/Rust/badge.svg)](https://github.com/bitflags/bitflags/actions) [![Latest version](https://img.shields.io/crates/v/bitflags.svg)](https://crates.io/crates/bitflags) [![Documentation](https://docs.rs/bitflags/badge.svg)](https://docs.rs/bitflags) ![License](https://img.shields.io/crates/l/bitflags.svg) `bitflags` generates flags enums with well-defined semantics and ergonomic end-user APIs. You can use `bitflags` to: - provide more user-friendly bindings to C APIs where flags may or may not be fully known in advance. - generate efficient options types with string parsing and formatting support. You can't use `bitflags` to: - guarantee only bits corresponding to defined flags will ever be set. `bitflags` allows access to the underlying bits type so arbitrary bits may be set. - define bitfields. `bitflags` only generates types where set bits denote the presence of some combination of flags. - [Documentation](https://docs.rs/bitflags) - [Specification](https://github.com/bitflags/bitflags/blob/main/spec.md) - [Release notes](https://github.com/bitflags/bitflags/releases) ## Usage Add this to your `Cargo.toml`: ```toml [dependencies] bitflags = "2.5.0" ``` and this to your source code: ```rust use bitflags::bitflags; ``` ## Example Generate a flags structure: ```rust use bitflags::bitflags; // The `bitflags!` macro generates `struct`s that manage a set of flags. bitflags! { /// Represents a set of flags. #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)] struct Flags: u32 { /// The value `A`, at bit position `0`. const A = 0b00000001; /// The value `B`, at bit position `1`. const B = 0b00000010; /// The value `C`, at bit position `2`. const C = 0b00000100; /// The combination of `A`, `B`, and `C`. const ABC = Self::A.bits() | Self::B.bits() | Self::C.bits(); } } fn main() { let e1 = Flags::A | Flags::C; let e2 = Flags::B | Flags::C; assert_eq!((e1 | e2), Flags::ABC); // union assert_eq!((e1 & e2), Flags::C); // intersection assert_eq!((e1 - e2), Flags::A); // set difference assert_eq!(!e2, Flags::A); // set complement } ``` ## Rust Version Support The minimum supported Rust version is documented in the `Cargo.toml` file. This may be bumped in minor releases as necessary.