ModBitTracker

Object
- ModBitTracker

All Implemented Interfaces:

Serializable, Cloneable
```
public class ModBitTracker
extends Object
implements Serializable, Cloneable
```
ModBitTracker maintains a BitSet for each variable at a program point. The BitSet indicates, for each sample seen in order, whether that variable was present or not.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor Description

ModBitTracker(int num_vars)
Creates a ModBitTracker.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(ValueTuple vt, int count)`	Add to this the modbits for the given ValueTuple.
`void`	`checkRep()`	Check the representation invariant.
`BitSet`	`get(int varindex)`	Returns a BitSet of modbit values for the given variable.
`boolean`	`get(int varindex, int sampleno)`	Returns the modbit for the given variable and sample number.
`int`	`num_samples()`
`int`	`num_sets()`	Accessor for testing only.
`int`	`num_vars()`

Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ModBitTracker
```
public ModBitTracker(int num_vars)
```
    Creates a ModBitTracker.
    
    Parameters:
    
    num_vars - number of variables to allocate space for
- Method Detail
  - num_vars
```
public int num_vars()
```
  - num_samples
```
public int num_samples()
```
  - num_sets
```
public int num_sets()
```
    Accessor for testing only.
  - checkRep
```
public void checkRep(@UnknownInitialization(ModBitTracker.class) ModBitTracker this)
```
    Check the representation invariant.
  - get
```
public BitSet get(int varindex)
```
    Returns a BitSet of modbit values for the given variable. The caller must not modify the returned value!
  - get
```
public boolean get(int varindex,
                   int sampleno)
```
    Returns the modbit for the given variable and sample number.
  - add
```
public void add(ValueTuple vt,
                int count)
```
    Add to this the modbits for the given ValueTuple.