com.aol.cyclops.closures.mutable

Class MutableDouble

java.lang.Object

com.aol.cyclops.closures.mutable.MutableDouble

Type Parameters:

T - Type held inside closed var

All Implemented Interfaces:

java.util.function.DoubleSupplier

public class MutableDouble
extends java.lang.Object
implements java.util.function.DoubleSupplier

Class that represents a Closed Variable In Java 8 because of the effectively final rule references to captured variables can't be changed. e.g.

 
 String var = "hello";
 Runnable r = () -> var ="world";
 

Won't compile because var is treated as if it is final. This can be 'worked around' by using a wrapping object or array. e.g.

 Mutable<String> var =  Mutable.of("hello");
 Runnable r = () -> var.set("world");
 

Constructor Summary

Constructors

Constructor and Description
MutableDouble()

Method Summary

Modifier and Type	Method and Description
double	getAsDouble()
MutableDouble	mutate(java.util.function.DoubleFunction<java.lang.Double> varFn)
static <T> MutableDouble	of(double var) Create a Mutable variable, which can be mutated inside a Closure e.g.
MutableDouble	set(double var)

Methods inherited from class java.lang.Object

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

Constructor Detail

MutableDouble

public MutableDouble()

Method Detail

of

public static <T> MutableDouble of(double var)

Create a Mutable variable, which can be mutated inside a Closure e.g.

   Mutable<Integer> num = Mutable.of(20);
   
   Stream.of(1,2,3,4).map(i->i*10).peek(i-> num.mutate(n->n+i)).foreach(System.out::println);
   
   System.out.println(num.get());
   //prints 120
  

Parameters:

var - Initial value of Mutable

Returns:

New Mutable instance

getAsDouble

public double getAsDouble()

Specified by:

getAsDouble in interface java.util.function.DoubleSupplier

Returns:

Current value

set

public MutableDouble set(double var)

Parameters:

var - New value

Returns:

this object with mutated value

mutate

public MutableDouble mutate(java.util.function.DoubleFunction<java.lang.Double> varFn)

Parameters:

varFn - New value

Returns:

this object with mutated value