Macro altbitflags::flag_ro
[−]
[src]
macro_rules! flag_ro { ($name:ident, $pos:expr) => { ... }; ($name:ident, $full_name:ident, $pos:expr) => { ... }; }
Create read-only flag.
It accepts a name argument, optional full name argument and a number, which indicates the bit number with required flag.
Later, the given flag can be accessed either by short or full name in a form of a normal function.
It will work only if it's put in a structure implementation where integer number with bit fields can be accessed with 'self.0'.
ReadOnly flags accepts 'self.0' to be of any integer type.
Example
#[macro_use] extern crate altbitflags; struct Something(i64); impl Something { flag_ro!(present, 0); flag_ro!(tx, 1); flag_ro!(e, extended, 2); // It is okay to define different functions for a single bit: flag_ro!(some, 3); flag_ro!(some_bit, 3); } fn main() { let mut something = Something(0); if (something.present()) { /* ... */ } if (something.tx()) { /* ... */ } // These do the same thing: if (something.e()) { /* ... */ } if (something.extended()) { /* ... */ } }