DoubleToDouble

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface DoubleToDouble
```
Created by Rafael on 9/18/2017.

- Method Summary
  
  Modifier and Type Method Description
  
  double Eval(double in)

- Method Detail
  - Eval
```
double Eval(double in)
```