#include <vector>
#include <QVector>

struct MyData
{
    MyData(const QString& str) : str(str) {}
    const QString str;
};

int main()
{
    std::vector<MyData> sVec{MyData("A"), MyData{"B"}}; // OK
    sVec.push_back(MyData("C"));                        // OK
    sVec.emplace_back("D");                             // OK

    QVector<MyData> qVec{MyData("A"), MyData{"B"}}; // OK
    qVec.push_back(MyData("C"));                    // OK in Qt 5. Fails to compile in Qt 6
    qVec.emplace_back("D");                         // N/A in Qt 5. Fails to compile in Qt 6
}