bind_match

Convenience macro similar to matches! but lets you bind to and pattern and return an Option of the result.

The input of the macro looks like this:

bind_match!(input_expr, pattern => binding_expr)

Or with pattern guards:

bind_match!(input_expr, pattern if guard => binding_expr)

The binding_expr is returned, with variables bound in the pattern.

Example

This can be particularly useful when matching inside iterator adapters.

```Rust use bindmatch::bindmatch;

enum Foo { A(Option, bool), B { open: bool, closed: bool }, } struct Bar { foo: Foo, fun: bool, }

fn funwhenopen(bars: impl IntoIterator) -> Option { bars.intoiter() .filtermap(|bar| bind_match!(bar, Bar { foo: Foo::B { open, .. }, fun } if open => fun )) .next() } ```