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QGVector Class Reference

The QGVector class is an internal class for implementing Qt collection classes. More...

#include <qgvector.h>

Inherits QCollection.

List of all member functions.

Public Members

• virtual int compareItems ( Item d1, Item d2 )

Protected Members

• virtual QDataStream & read ( QDataStream & s, Item & d )
• virtual QDataStream & write ( QDataStream & s, Item ) const

Detailed Description

The QGVector class is an internal class for implementing Qt collection classes.

QGVector is a strictly internal class that acts as a base class for the QVector collection class.

QGVector has some virtual functions that may be reimplemented in subclasses to customize behavior.

• compareItems() compares two collection/vector items.
• read() reads a collection/vector item from a QDataStream.
• write() writes a collection/vector item to a QDataStream.

Member Function Documentation

int QGVector::compareItems ( Item d1, Item d2 ) [virtual]

Returns:

• 0 if item1 == item2
• non-zero if item1 != item2

This function returns int rather than bool so that reimplementations can return one of three values and use it to sort by:

• 0 if item1 == item2
• > 0 (positive integer) if item1 > item2
• < 0 (negative integer) if item1 < item2

The QVector::sort() and QVector::bsearch() functions require that compareItems() is implemented as described here.

This function should not modify the vector because some const functions call compareItems().

QDataStream & QGVector::read ( QDataStream & s, Item & d ) [virtual protected]

The default implementation sets item to 0.

See also write().

QDataStream & QGVector::write ( QDataStream & s, Item ) const [virtual protected]

The default implementation does nothing.

See also read().

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