Function googletest::matchers::predicate

pub fn predicate<T: Debug + ?Sized, P>(
    predicate: P
) -> PredicateMatcher<T, P, NoDescription, NoDescription>
where
    for<'a> P: Fn(&'a T) -> bool,

Creates a matcher based on the predicate provided.

verify_that!(3, predicate(|x: &i32| x % 2 == 1))?;  // Passes

The predicate should take the subject type by reference and return a boolean.

Note: even if the Rust compiler should be able to infer the type of the closure argument, it is likely that it won’t. See https://github.com/rust-lang/rust/issues/12679 for update on this issue. This is easily fixed by explicitly declaring the type of the argument