NullaryFunction (Jep with extensions API )

java.lang.Object
- com.singularsys.jep.functions.PostfixMathCommand
- - com.singularsys.jep.functions.NullaryFunction

All Implemented Interfaces:

PostfixMathCommandI, java.io.Serializable

Direct Known Subclasses:

ConstantFunction, JepTest.MyNullary, LightWeightComponentSetTest.NonThreadSafeFunction, Random, ThreadSafeRandom
```
public abstract class NullaryFunction
extends PostfixMathCommand
```
Convenient base class for zero-argument nullary functions, like random(). Defines an Object eval() method for calculating the result.

Since:

3.5

See Also:

Serialized Form

Field Summary
- Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand
  curNumberOfParameters, name, NaN, numberOfParameters

Constructor Summary

Constructors
Constructor Description

NullaryFunction()

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`abstract java.lang.Object`	`eval()`	Evaluate the function
`static NullaryFunction`	`instanceOf(java.util.function.Supplier<? super java.lang.Object> fun)`	Create a NullaryFunction from a lambda expression.
`void`	`run(java.util.Stack<java.lang.Object> stack)`	Calls `eval()`

Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand
asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, checkNumberOfParameters, getName, getNumberOfParameters, setCurNumberOfParameters, setName, toString, toString

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

- Constructor Detail
  - NullaryFunction
```
public NullaryFunction()
```
- Method Detail
  - run
```
public void run(java.util.Stack<java.lang.Object> stack)
         throws EvaluationException
```
    Calls eval()
    
    Specified by:
    
    run in interface PostfixMathCommandI
    
    Overrides:
    
    run in class PostfixMathCommand
    
    Parameters:
    
    stack - arguments for function
    
    Throws:
    
    EvaluationException - if function cannot be evaluated
  - eval
```
public abstract java.lang.Object eval()
                               throws EvaluationException
```
    Evaluate the function
    
    Returns:
    
    value of the function
    
    Throws:
    
    EvaluationException
  - instanceOf
```
public static NullaryFunction instanceOf(java.util.function.Supplier<? super java.lang.Object> fun)
```
    Create a NullaryFunction from a lambda expression. For example NullaryFunction.instanceOf(() -> Math.sqrt(2.0)
    
    Parameters:
    
    fun - the lambda function
    
    Returns:
    
    a new NullaryFunction instance
    
    Since:
    
    Jep 4.0