Macro bitflags 

macro_rules! bitflags {
    (
        $(#[$outer:meta])*
        $vis:vis struct $Name:ident : $T:ty {
            $(
                $(#[$inner:meta])*
                const $FLAG:ident = $value:expr;
            )*
        }
    ) => { ... };
}

Defines a bitflags struct with the given flags.

Example

bitflags! {
    /// Documentation for the flags struct
    pub struct MyFlags: u32 {
        /// First flag
        const FLAG_A = 1 << 0;
        /// Second flag
        const FLAG_B = 1 << 1;
    }
}

This generates:

• A struct MyFlags(u32) with Copy, Clone, Debug, Default, PartialEq, Eq, Hash
• Associated constants MyFlags::FLAG_A, MyFlags::FLAG_B, etc.
• An empty() constructor
• contains(&self, other: Self) -> bool
• insert(&mut self, other: Self)
• remove(&mut self, other: Self)
• is_empty(&self) -> bool
• Bitwise operators: |, &, ^, !, |=, &=, ^=