std::vector::size() returns a size_type which is unsigned and usually the same as size_t, e.g. it is 8 bytes on 64bit platforms. In constrast, QVector::size() returns an int which is usually 4 byt...

I am new to c++ and Qt and I am trying to initialize a QVector, which is a class member in a class initialization list like: MyClass::MyClass(QWidget *parent) : QMainWindow(parent) , myVector(QVec...

My question is basically when to choose QVector and when to choose QList as your Qt container. What I already know: Qt docs: QList class For most purposes, QList is the right class to use. It...

I have a class B that creates an object of a class A and calls a method of the object. a.h #ifndef A_H #define A_H class A { public: A(int); void function(); }; #endif // A_H a.cpp #incl...

I can see that that classes are treated as complex objects which are required for calling default constructor: void QVector<T>::defaultConstruct(T *from, T *to) { if (QTypeInfo<T>::is...

I'm very confused as to why this isn't working. I must be misunderstanding something key about QVectors... I've created an MCVE to show the issue: #include <QCoreApplication> #include <Q...

I have a QVector QVector(48, 64, 31, -2, 14, 5, 7, -3, -1, 13) I want to know how to use Qt mechanism to remove all the elements that are smaller than 0. How do I do this in a simple way? Than...

The Qt container classes QList<T>, QVector<T> etc. require their element types to be copyable. Since C++11, the STL containers require their element type to be copyable or movable only....