#define QT_STRICT_ITERATORS
#include <QVector>
#include <QApplication>
#include <QDebug>

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	QVector<QPointF> v; v.append(QPointF(1, 2));
	for (auto& p : v) p.ry() -= 1;
	qDebug() << v.at(0).y();
	return 0;
}

main.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class QTypedArrayData<class QPointF>::iterator __thiscall QVector<class QPointF>::begin(class QTypedArrayData<class QPointF>::iterator)" (__imp_?begin@?$QVector@VQPointF@@@@QAE?AViterator@?$QTypedArrayData@VQPointF@@@@V23@@Z) referenced in function _main