Declaration of Qvector from std vector

Question

I'm trying to create a Qvector from and std::Vector.

I can of course copy it element by element using a for loop, but I'm looking for a better way to do it.

So I tried:

QVector<double> qv  = QVector<double>::fromStdVector(values) ;

This works fine but I get a warning that it's deprecated.

I followed Hadi Navapour's suggestion from copying a std::vector to a qvector

and tried the following:

    QVector<double> qv  = QVector<double>(values.begin(), values.end());

but this code with begin() and end() does not compile, I get the following error:

error: no matching function for call to 'QVector::QVector(std::vector::iterator, std::vector::iterator)' QVector qv = QVector(values.begin(), values.end());

I believe this is supposed to use the following constructor QVector(InputIterator first, InputIterator last)

I can't get it to work.

Could someone please explain the right non-deprecated way to copy an std::vector to a Qvector?

Thanks in advance!

Answer 1

The documentation https://doc.qt.io/qt-5/qvector.html#fromStdVector enforces to use range constructors from version 5.14.

so may be you can use version flags for your implementation.

try as said below, if you are interested.

#if QT_VERSION <= QT_VERSION_CHECK(5,14,0)
    QVector<double> qv  = QVector<double>::fromStdVector(values) ;
#else
    QVector<double> qv  = QVector<double>(values.begin(), values.end());
#endif