Macro core_extensions::matches

macro_rules! matches {
    ( $expr:expr, $(|)? $pat:pat $(| $prev_pat:pat)* $(if $cond:expr)?) => { ... };
}

Evaluates to true if the expression matches any of the patterns (this macro can have multiple patterns).

This is equivalent to the std::matches macro, which requires Rust 1.42.0 .

Example

use core_extensions::matches;

let some = Some(10);
assert!( matches!(some, Some(10)));
assert!( matches!(some, Some(x) if x == 10));
assert!(!matches!(some, None));

let none = None;
assert!(!matches!(none, Some(10)));
assert!(!matches!(none, Some(x) if x == 10));
assert!( matches!(none, None));

 
for num in &[0, 1, 2, 3][..] {
    assert!(matches!(num, 0 | 1 | 2 | 3))
}
 
 
enum Primitive {
    Signed(i128),
    Unsigned(u128),
    Bool(bool),
    String(&'static str),
}
 
let prim = Primitive::Bool(false);
assert!(matches!(
    prim,
    | Primitive::Signed(_)
    | Primitive::Unsigned(_)
    | Primitive::Bool(_)
));