com.aol.cyclops.closures.mutable

Class MutableInt

java.lang.Object

com.aol.cyclops.closures.mutable.MutableInt

Type Parameters:

T - Type held inside closed var

All Implemented Interfaces:

java.util.function.IntSupplier

public class MutableInt
extends java.lang.Object
implements java.util.function.IntSupplier

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
MutableInt()

Method Summary

Modifier and Type	Method and Description
int	getAsInt()
MutableInt	mutate(java.util.function.IntFunction<java.lang.Integer> varFn)
static MutableInt	of(int var) Create a Mutable variable, which can be mutated inside a Closure e.g.
MutableInt	set(int var)

Methods inherited from class java.lang.Object

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

Constructor Detail

MutableInt

public MutableInt()

Method Detail

of

public static MutableInt of(int var)

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

   MutableInt num = MutableInt.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

getAsInt

public int getAsInt()

Specified by:

getAsInt in interface java.util.function.IntSupplier

Returns:

Current value

set

public MutableInt set(int var)

Parameters:

var - New value

Returns:

this object with mutated value

mutate

public MutableInt mutate(java.util.function.IntFunction<java.lang.Integer> varFn)

Parameters:

varFn - New value

Returns:

this object with mutated value