com.aol.cyclops.closures.mutable

Class MutableLong

java.lang.Object

com.aol.cyclops.closures.mutable.MutableLong

Type Parameters:

T - Type held inside closed var

All Implemented Interfaces:

java.util.function.LongSupplier

public class MutableLong
extends java.lang.Object
implements java.util.function.LongSupplier

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
MutableLong()

Method Summary

Modifier and Type	Method and Description
long	getAsLong()
MutableLong	mutate(java.util.function.LongFunction<java.lang.Long> varFn)
static MutableLong	of(long var) Create a Mutable variable, which can be mutated inside a Closure e.g.
MutableLong	set(long var)

Methods inherited from class java.lang.Object

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

Constructor Detail

MutableLong

public MutableLong()

Method Detail

of

public static MutableLong of(long 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

getAsLong

public long getAsLong()

Specified by:

getAsLong in interface java.util.function.LongSupplier

Returns:

Current value

set

public MutableLong set(long var)

Parameters:

var - New value

Returns:

this object with mutated value

mutate

public MutableLong mutate(java.util.function.LongFunction<java.lang.Long> varFn)

Parameters:

varFn - New value

Returns:

this object with mutated value