<solved> C2662: 'function' : cannot convert 'this' pointer from 'type1' to 'type2'
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Hello people,
I have a QHash<quint32, DataItem> dynamicData which is not const!
@
#pragma once
#include <QtGui>
#include <QString>
#include <QHash>
#include "DataItem.h"class DataController
{
public:
DataController(void);
~DataController(void);
int removeDataItem(qint32 key) const;
protected:
QHash<qint32, DataItem> dynamicData;
};
@And my source
@
#include <QHash>
#include "DataController.h"DataController::DataController(void)
{
//
}int DataController::removeDataItem(qint32 key) const
{
return this->dynamicData.remove( key ) ;
}
@
I get error C2662: 'QHash<Key,T>::remove' : cannot convert 'this' pointer from 'const QHash<Key,T>' to 'QHash<Key,T> &'
My dynamicData is not constant, so remove should be callable.
Whats the matter? I dont see the error..Cheers
Huck -
Your removeDataItem() is const function, and its trying to remove/modify your class member variable. That may be the problem??
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[quote author="Vijay Bhaska Reddy" date="1311172988"]Your removeDataItem() is const function, and its trying to remove/modify your class member variable. That may be the problem??[/quote]
It definitely is!
A const method cannot modify the current instance (pointed by "this"). You have a conception problem in here : how could a method that removes an item from a container not modify the instance which "owns" the container...
Of course there are workaround if you REALLY want the method to be const. You can either declare your QHash<qint32, DataItem> mutable or use const_cast to remove the "const" in front of the ‘const QHash<Key,T>’. I would'nt recommend this though.
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My suggestion is .. I don't see a good reason why your removeDataItem() should be const. Remove const.
