Package io.deephaven.function

Interface ToDoubleFunction<T>

Type Parameters:

T - the input type

All Superinterfaces:

ToDoubleFunction<T>, ToPrimitiveFunction<T>, TypedFunction<T>

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface ToDoubleFunction<T>
extends ToPrimitiveFunction<T>, ToDoubleFunction<T>

A double function.

Nested Class Summary

Nested classes/interfaces inherited from interface io.deephaven.function.ToPrimitiveFunction

ToPrimitiveFunction.Visitor<T,R>

Method Summary

Modifier and Type	Method	Description
double	applyAsDouble(T value)
static <T> ToDoubleFunction<T>	cast()	Assumes the object value is directly castable to a double.
static <T, R> ToDoubleFunction<T>	map(Function<? super T,? extends R> f, ToDoubleFunction<? super R> g)	Creates the function composition g ∘ f.
default DoubleType	returnType()	This function's return type.
default <R> R	walk(ToPrimitiveFunction.Visitor<T,R> visitor)

Methods inherited from interface io.deephaven.function.ToPrimitiveFunction

walk

Method Details

cast

static <T> ToDoubleFunction<T> cast()

Assumes the object value is directly castable to a double. Equivalent to x -> (double)x.

Type Parameters:

T - the value type

Returns:

the double function

map

static <T,
R> ToDoubleFunction<T> map(Function<? super T,? extends R> f,
 ToDoubleFunction<? super R> g)

Creates the function composition g ∘ f.

Equivalent to x -> g.applyAsDouble(f.apply(x)).

Type Parameters:

T - the input type

R - the intermediate type

Parameters:

f - the inner function

g - the outer function

Returns:

the double function

applyAsDouble

double applyAsDouble(T value)

Specified by:

applyAsDouble in interface ToDoubleFunction<T>

returnType

default DoubleType returnType()

Description copied from interface: TypedFunction

This function's return type.

Specified by:

returnType in interface ToPrimitiveFunction<T>

Specified by:

returnType in interface TypedFunction<T>

Returns:

the type

walk

default <R> R walk(ToPrimitiveFunction.Visitor<T,R> visitor)

Specified by:

walk in interface ToPrimitiveFunction<T>