Romain Vimont authored Sep 11, 2018 and Thomas Guillem committed Nov 15, 2018

Add a helper to create RAII wrappers for C shared resources, which
automatically call the Hold() and Release() functions associated to the
raw pointer.

Just declare a new shared resource wrapper type:

    using InputItemPtr = vlc_shared_data_ptr_type(input_item_t,
                                                  input_item_Hold,
                                                  input_item_Release);

Then use this new type directly:

    input_item_t *ptr = /* ... */;
    InputItemPtr item(ptr);
    QString name = item->psz_name;
    InputItemPtr other = item; /* hold automatically */