QMap requires a public destructor in Qt 5, it is a behavioral change since Qt 4 and it is not documented

In Qt 4 it was possible to have a private destructor in a class that was using QMap, but in Qt 5 this is not possible.

In Qt/qtbase/corelib/tools/qmap.h destroySubTree()

template <class Key, class T>
void QMapNode<Key, T>::destroySubTree()
{
    if (QTypeInfo<Key>::isComplex)
        key.~Key();
    if (QTypeInfo<T>::isComplex)
        value.~T();

the destructor is called directly instead of delete. Is there a reasoning behind this? If yes, then it must be documented to be a requirement for QMap.