Trait Narrow 

pub trait Narrow<N> {
    // Required method
    fn narrow(&self) -> Option<N>;
}

Storing a value in a narrower type, exactly or not at all.

Contract

narrow returns Some(n) only when n is the same number, and None exactly when no value of the narrow type is. It never rounds and never wraps. Widening the result has to give back what was narrowed.

What implements it

The rational types of this crate, into each of the fixed width rational types.

The table is deliberately smaller than Absorb’s, and not because the rest is unwanted. Narrowing into the markers of fixed and into the primitive integers is the other half of what makes those types worth storing, and it is simply not written yet. The asymmetry is a gap, not a statement that those conversions do not make sense.

Required Methods

fn narrow(&self) -> Option<N>

This value in the narrow type, if it fits.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors