[SOLVED] QtInternals: Using D-pointer in custom classes?
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I think that using these macros "as is" (i.e. you don't re-define them) for your own classes will not "collide" with Qt's code. But you have to be aware that anything that is not part of the "public" Qt API, but only used internally, might be subject to change in future versions without notice or taking care of backward compatibility.