Macro std::matches

1.42.0 · source · [−]
macro_rules! matches {
    ($expression:expr, $(|)? $( $pattern:pat_param )|+ $( if $guard: expr )? $(,)?) => { ... };
}
Expand description

Returns whether the given expression matches any of the given patterns.

Like in a match expression, the pattern can be optionally followed by if and a guard expression that has access to names bound by the pattern.

Examples

let foo = 'f';
assert!(matches!(foo, 'A'..='Z' | 'a'..='z'));

let bar = Some(4);
assert!(matches!(bar, Some(x) if x > 2));
Run