• The QVariant class acts like a union for the most common Qt data types. ... #include <qvariant.h>. List of all member functions.
  • The QVariant class is a cornerstone in Qt. It's used in the property system in model/view to exchange data between C++ and QML. But what is a QVariant, exact...
    7 bin görüntüleme
    Yayınlandı22 Ara 2020
  • Here are some key features and concepts related to QVariant: 1. Dynamic Typing: QVariant allows you to store values of different types in the same variable.
  • Need to document parameter types and convert the QVariant to the exact type before using. Possibly need to check for the actual type stored in QVariant.
  • The QVariant class acts like a union for the most common Qt data types. ... QVariant(QMetaType type, const void *copy = nullptr).
  • QVariant can storeArbitrarytype of data. If you want to makeCustom typeOr other non-QMettype built-in types are used in qvariant, you must use this...
  • // Data assignment // the type of d has already been set, but other field are not set static void customConstruct(QVariant::Private *d, const void *copy) {.
  • If QVariant is a template, every class that store a QVariant needs to become a template. QVariant must work for both POD and non-POD data types.
  • QVariant is used to store references to values where you don't necessarily know what is inside.
  • The QVariant class acts like a union for the most common Qt data types. ... #include <qvariant.h>. List of all member functions.