QScopedPointer uses delete []

[Kofr]

Why QScopedPointer uses delete [] instead of simpledelete?

template <typename T>
struct QScopedPointerArrayDeleter
{
    static inline void cleanup(T *pointer)
    {
        // Enforce a complete type.
        // If you get a compile error here, read the section on forward declared
        // classes in the QScopedPointer documentation.
        typedef char IsIncompleteType[ sizeof(T) ? 1 : -1 ];
        (void) sizeof(IsIncompleteType);

        delete [] pointer;
    }
};

[VRonin]

http://doc.qt.io/qt-5/qscopedpointer.html#custom-cleanup-handlers
You chose what to use by specifying the second template argument.
QScopedPointer<int> uses delete
QScopedPointer<int,QScopedPointerArrayDeleter> uses delete []