> For the complete documentation index, see [llms.txt](https://docs.optitrack.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.optitrack.com/v1.1/developer-tools/motive-api/class-cuid.md).

# Class: cUID

### Declaration: NPTrackingTools.h

{% code overflow="wrap" %}

```
   /// <summary>
   /// A platform-neutral 128-bit universal identifier. It is essentially guaranteed to never
   /// generate the same ID twice.
   /// </summary>
   class cUID
   {
   public:
       typedef unsigned long long int uint64;
```

{% endcode %}

{% code overflow="wrap" %}

```
       /// <summary>
       /// Create a default UID. In order to create a UID that has a valid unique identifier you
       /// must call Generate().
       /// </summary>
       cUID() : mHighBits( 0 ), mLowBits( 0 ) { }
```

{% endcode %}

{% code overflow="wrap" %}

```
       cUID( uint64 high, uint64 low ) : mHighBits( high ), mLowBits( low ) { }
       cUID( const cUID & obj ) : mHighBits( obj.mHighBits ), mLowBits( obj.mLowBits ) { }
       cUID&           operator=( const cUID & rhs ) { mHighBits = rhs.mHighBits; mLowBits = rhs.mLowBits; return *this; }
```

{% endcode %}

{% code overflow="wrap" %}

```
       /// <summary>
       /// Set the value of the UID from two long integer values. It is up to the caller to ensure that
       /// the resulting UID is unique.
       /// </summary>
       void            SetValue( uint64 highBits, uint64 lowBits ) { mHighBits = highBits; mLowBits = lowBits; }
```

{% endcode %}

```
       /// <summary>Get the low 64 bits of the UID.</summary>
       uint64          LowBits() const { return mLowBits; }
```

```
       /// <summary>Get the high 64 bits of the UID.</summary>
       uint64          HighBits() const { return mHighBits; }
```

```
       /// <summary>Returns true if the ID is valid.</summary>
       bool            Valid() const { return ( mHighBits != 0 && mLowBits != 0 ); }
```

```
       /// <summary>Generate a new UID value.</summary>
       static cUID     Generate();
```

{% code overflow="wrap" %}

```
       //====================================================================================
       // Comparison operators
       //====================================================================================
```

{% endcode %}

{% code overflow="wrap" %}

```
       bool            operator<( const cUID & rhs ) const
       {
           return ( ( mHighBits < rhs.mHighBits ) ? true : ( mHighBits == rhs.mHighBits ? ( mLowBits < rhs.mLowBits ) : false ) );
       }
       bool            operator<=( const cUID & rhs ) const
       {
           return ( ( mHighBits < rhs.mHighBits ) ? true : ( mHighBits == rhs.mHighBits ? ( mLowBits <= rhs.mLowBits ) : false ) );
       }
       bool            operator>( const cUID & rhs ) const { return !( *this <= rhs ); }
       bool            operator>=( const cUID & rhs ) const { return !( *this < rhs ); }
       bool            operator==( const cUID & rhs ) const
       {
           return ( ( mHighBits == rhs.mHighBits ) && ( mLowBits == rhs.mLowBits ) );
       }
       bool            operator!=( const cUID & rhs ) const { return !( *this == rhs ); }
```

{% endcode %}

{% code overflow="wrap" %}

```
       //====================================================================================
       // Constants
       //====================================================================================
```

{% endcode %}

```
       static const cUID Invalid;
```

{% code overflow="wrap" %}

```
   private:
       uint64          mHighBits;
       uint64          mLowBits;
   };
```

{% endcode %}


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