src_corelib_kernel_qmetatype.cpp

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struct MyStruct
{
    int i;
    ...
};
 
Q_DECLARE_METATYPE(MyStruct)
 
 
namespace MyNamespace
{
    ...
}
 
Q_DECLARE_METATYPE(MyNamespace::MyStruct)
 
 
MyStruct s;
QVariant var;
var.setValue(s); // copy s into the variant
 
...
 
// retrieve the value
MyStruct s2 = var.value<MyStruct>();
 
 
int id = QMetaType::type("MyClass");
if (id != QMetaType::UnknownType) {
    void *myClassPtr = QMetaType::create(id);
    ...
    QMetaType::destroy(id, myClassPtr);
    myClassPtr = 0;
}
 
 
qRegisterMetaType<MyClass>("MyClass");
 
 
QDataStream &operator<<(QDataStream &out, const MyClass &myObj);
QDataStream &operator>>(QDataStream &in, MyClass &myObj);
 
 
int id = qRegisterMetaType<MyStruct>();
 
 
int id = qMetaTypeId<QString>();    // id is now QMetaType::QString
id = qMetaTypeId<MyStruct>();       // compile error if MyStruct not declared
 
typedef QString CustomString;
qRegisterMetaType<CustomString>("CustomString");
 
 
#include <deque>
 
Q_DECLARE_SEQUENTIAL_CONTAINER_METATYPE(std::deque)
 
void someFunc()
{
    std::deque<QFile*> container;
    QVariant var = QVariant::fromValue(container);
    // ...
}
 
 
 
#include <unordered_list>
 
Q_DECLARE_ASSOCIATIVE_CONTAINER_METATYPE(std::unordered_map)
 
void someFunc()
{
    std::unordered_map<int, bool> container;
    QVariant var = QVariant::fromValue(container);
    // ...
}
 
 
QPointer<QFile> fp(new QFile);
QVariant var = QVariant::fromValue(fp);
// ...
if (var.canConvert<QObject*>()) {
    QObject *sp = var.value<QObject*>();
    qDebug() << sp->metaObject()->className(); // Prints 'QFile'.
}
 
 
#include <memory>
 
Q_DECLARE_SMART_POINTER_METATYPE(std::shared_ptr)
 
void someFunc()
{
    auto smart_ptr = std::make_shared<QFile>();
    QVariant var = QVariant::fromValue(smart_ptr);
    // ...
    if (var.canConvert<QObject*>()) {
        QObject *sp = var.value<QObject*>();
        qDebug() << sp->metaObject()->className(); // Prints 'QFile'.
    }
}