Const double * to QVector<double>

beecksche

Hello,
i got a pointer to an array with double values. But i need the values in a QVector.

const double *array = externObject->getArray();

QVector<double> myArray = array;// how to solve this problem

I can do a for loop, but it doesn't look very well:

QVector<double> myArray;
for(int i = 0; i < externObject->arrayCount(); i++) {
  myArray << externObject->getArray()[i];
}

Is there a better way to do that?

Thanks

kshegunov

@beecksche

int count = externObject->arrayCount();
const double * array = externObject->getArray();

QVector<double> myArray(count);
::memcpy(myArray.data(), array, count * sizeof(double));

VRonin

your solution is more than acceptable, an alternative is:

QVector<double> myArray(externObject->arrayCount());
std::copy(array,array + externObject->arrayCount(),myArray.begin());

raven-worx

@beecksche
you implicitly already showed that it isn't possible with an assignment operator only. (Edit: but i guess that's not what you were after afterall?)
In your loop you used arrayCount() to determine the item count. How would you do it in the assignment operator?

beecksche

Thanks everybody for the replies.

I recognized that i need to modify some values. However the loop seems the best way! Thanks a lot!