Simple question about QVector append for pointers

kahlenberg

Hi,
I have a QVector and I want to append elements into it. What is the correct way? I get always compiler errors.
I dont want to post errors, I need only correct syntax :)

.h file:

private:
    QVector<SystemUnit> SystemUnits; 
    int AddElement(SystemUnit *SU);
    int RemoveElement(int index);

.cpp file:


int Facility::AddElement(SystemUnit *SU)
{
    SystemUnits.append(&SU); // This syntax is absolutly wrong and I get compiler errors.
    return 0;
}

How to append in a QVector from a pointer object?

Thanks.

jsulm

@kahlenberg Your code is wrong:

QVector<SystemUnit> SystemUnits;

SystemUnits is a vector for SystemUnit not pointers to SystemUnit. It should be:

QVector<SystemUnit*> SystemUnits;

int Facility::AddElement(SystemUnit *SU)
{
    // Since SU is already a pointer you do not need &, just fix SystemUnit like described above
    SystemUnits.append(&SU); // This syntax is absolutly wrong and I get compiler errors.
    return 0;
}

VRonin

@kahlenberg said:

    SystemUnits.append(&SU); // This syntax is absolutly wrong and I get compiler errors.

The dereferencing operator in C++ is * not &

Depends what you want to do here:

to store a copy of SU (not SU itself) use SystemUnits.append(*SU);
to store the same item SU is pointing to then declare QVector<SystemUnit*> SystemUnits; and use SystemUnits.append(SU);