PNCounter

All Superinterfaces:

Crdt
```
public interface PNCounter
extends Crdt
```
A Positive-Negative Counter.
A Positive-Negative Counter is a counter that allows both incrementing, and decrementing. It is based on two GCounter's, a positive one that is incremented for every increment, and a negative one that is incremented for every decrement. The current value of the counter is calculated by subtracting the negative counter from the positive counter.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`long`	`decrement(long by)`	Decrement the counter.
`long`	`getValue()`	Get the current value of the counter.
`long`	`increment(long by)`	Increment the counter.

- Method Detail
  - getValue
```
long getValue()
```
    Get the current value of the counter.
    
    Returns:
    
    The current value of the counter.
  - increment
```
long increment(long by)
```
    Increment the counter.
    If by is negative, then the counter will be decremented by that much instead.
    
    Parameters:
    
    by - The amount to increment the counter by.
    
    Returns:
    
    The new value of the counter.
  - decrement
```
long decrement(long by)
```
    Decrement the counter.
    If by is negative, then the counter will be incremented by that much instead.
    
    Parameters:
    
    by - The amount to decrement the counter by.
    
    Returns:
    
    The new value of the counter.