Trait rand_functors::Functor

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pub trait Functor<I: Inner> {
    // Required method
    fn pure(i: I) -> Self;
}

Expand description

A container used by a RandomStrategy during computations.

In functional programming, the Functor pattern allows one to apply functions to values inside a container type, without changing the container’s structure. A Functor must support an fmap operation, which applies the function passed to it as a parameter to the contents of the Functor. This operation is not a method required by Functor due to the limitations of Rust’s type system.

Additionally, this trait requires that implementors provide the pure associated function. This provides for a way to begin a series of fmap, fmap_flat, and fmap_rand operations. This requirement technically puts this crate’s functors halfway between “normal” functors and applicative functors, as a subset of the former and a superset of the latter. However, implementing full applicative functors would be unnecessary for the sorts of computations that this crate focuses on.

Required Methods§

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fn pure(i: I) -> Self

Produce an instance of Self containing the argument as its inner.

This associated function is often used to begin a series of computations. The associated functions of RandomStrategy only operate on the Functor associated with that RandomStrategy.