Package com.jnape.palatable.lambda.functions.builtin.fn1

Class Downcast<A extends B,B>

java.lang.Object

com.jnape.palatable.lambda.functions.builtin.fn1.Downcast<A,B>

Type Parameters:

A - the subtype

B - the supertype

All Implemented Interfaces:

Fn1<B,A>, Applicative<A,Fn1<B,?>>, Cartesian<B,A,Fn1<?,?>>, Cocartesian<B,A,Fn1<?,?>>, Contravariant<B,Profunctor<?,A,Fn1<?,?>>>, Functor<A,Fn1<B,?>>, Profunctor<B,A,Fn1<?,?>>, Monad<A,Fn1<B,?>>, MonadReader<B,A,Fn1<B,?>>, MonadRec<A,Fn1<B,?>>, MonadWriter<B,A,Fn1<B,?>>

public final class Downcast<A extends B,B>
extends Object
implements Fn1<B,A>

Covariantly cast a value of type B to a value of subtype A. Unsafe.

Field Summary

Fields

Modifier and Type	Field	Description
private static final Downcast<?,?>	INSTANCE

Constructor Summary

Constructors

Modifier	Constructor	Description
private	Downcast()

Method Summary

Modifier and Type	Method	Description
A	checkedApply(B b)	Invoke this function with the given argument, potentially throwing any Throwable.
static <A extends B, B> Downcast<A,B>	downcast()
static <A extends B, B> A	downcast(B b)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.jnape.palatable.lambda.functions.Fn1

andThen, apply, carry, cartesian, censor, choose, cocartesian, compose, contraMap, diMap, diMapL, diMapR, discardL, discardR, flatMap, fmap, lazyZip, listens, local, pure, self, thunk, toFunction, trampolineM, widen, zip, zip

Methods inherited from interface com.jnape.palatable.lambda.functor.Functor

coerce

Field Details

INSTANCE

private static final Downcast<?,?> INSTANCE

Constructor Details

Downcast

private Downcast()

Method Details

checkedApply

public A checkedApply(B b)

Description copied from interface: Fn1

Invoke this function with the given argument, potentially throwing any Throwable.

Specified by:

checkedApply in interface Fn1<A extends B,B>

Parameters:

b - the argument

Returns:

the result of the function application

downcast

public static <A extends B,
B> Downcast<A,B> downcast()

downcast

public static <A extends B,
B> A downcast(B b)