Macro unrest_tmp_synom::cond [−] [src]

macro_rules! cond {
    ($i:expr, $cond:expr, $submac:ident!( $($args:tt)* )) => { ... };
    ($i:expr, $cond:expr, $f:expr) => { ... };
}

Conditionally execute the given parser.

If you are familiar with nom, this is nom's cond_with_error parser.

  • Syntax: cond!(CONDITION, THING)
  • Output: Some(THING) if the condition is true, else None