Helpers.Requiring

java.lang.Object
- scala.AnyVal
- - akka.util.Helpers.Requiring<A>

Enclosing class:

Helpers
```
public static final class Helpers.Requiring<A>
extends scala.AnyVal
```
Implicit class providing requiring methods. This class is based on Predef.ensuring in the Scala standard library. The difference is that this class's methods throw IllegalArgumentExceptions rather than AssertionErrors.
An example adapted from Predef's documentation:
```
 import akka.util.Helpers.Requiring

 def addNaturals(nats: List[Int]): Int = {
   require(nats forall (_ >= 0), "List contains negative numbers")
   nats.foldLeft(0)(_ + _)
 } requiring(_ >= 0)
 
```
param: value The value to check.

Constructor Summary

Constructors
Constructor Description

Requiring(A value)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(java.lang.Object x$1)`
`int`	`hashCode()`
`A`	`requiring(boolean cond, scala.Function0<java.lang.Object> msg)`	Check that a condition is true.
`A`	`requiring(scala.Function1<A,java.lang.Object> cond, scala.Function0<java.lang.Object> msg)`	Check that a condition is true for the `value`.
`A`	`value()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Requiring
```
public Requiring(A value)
```
- Method Detail
  - value
```
public A value()
```
  - requiring
```
public A requiring(boolean cond,
                   scala.Function0<java.lang.Object> msg)
```
    Check that a condition is true. If true, return value, otherwise throw an IllegalArgumentException with the given message.
    
    Parameters:
    
    cond - The condition to check.
    
    msg - The message to report if the condition isn't met.
  - requiring
```
public A requiring(scala.Function1<A,java.lang.Object> cond,
                   scala.Function0<java.lang.Object> msg)
```
    Check that a condition is true for the value. If true, return value, otherwise throw an IllegalArgumentException with the given message.
    
    Parameters:
    
    cond - The function used to check the value.
    
    msg - The message to report if the condition isn't met.
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class java.lang.Object
  - equals
```
public boolean equals(java.lang.Object x$1)
```
    Overrides:
    
    equals in class java.lang.Object