QVector copy

[Loc888]

I can't copy correctly the qvector data, everything i did, it crash at some point.
Copy constructor does work, but for some reason, whne i do some more copyes, at some point it crash, and i have no idea why. What should i do? I have a QVector, inside another QVector, and idk how should i copy it.

Data, is a object passed to the copy constructor.

    for(int i = 0; i < data.sequence.count(); i++)
    {this->sequence.append(data.sequence.data()[i].mid(0, data.sequence.data()[i].count()));}

[JKSH]

@Loc888 said in QVector copy:

at some point it crash, and i have no idea why.

Run your program in the debugger, and look at the Stack Trace when it crashes. It will show you why.

Data, is a object passed to the copy constructor.

for(int i = 0; i < data.sequence.count(); i++)
{this->sequence.append(data.sequence.data()[i].mid(0, data.sequence.data()[i].count()));}

Please show us the class/struct definitions for all of the types in your code.

data.sequence.data()[i]

This looks a bit strange.

Are you storing pointers to vectors? That is not necessary.

.mid(0, data.sequence.data()[i].count()))

This looks redundant.

vec.mid(0, vec.count()) simply returns a copy of vec.

[Loc888]

I fixed it, it's working fine. it wasn't even a QVector issue, but another pointer was crashing the program randomly

[JKSH]

@Loc888 said in QVector copy:

I fixed it, it's working fine.

Great!

another pointer was crashing the program randomly

This is a good example of why you should look for opportunities to avoid pointers.

As I said in my previous post, you don't need to store vector pointers, QVector<T>*. Just store the actual vector, QVector<T>.