c++ headers - fortitude between interface doing details


one classes way uses third-party library. library vigilant private member class:



// my.h
    #include <3pheader.h>

    category 
    {
    ...
    private:
       3pobject m_object;
    }


the problem - any section way uses category should configured consolidate 3p headers. relocating another kind 3p imperil whole build...
i twin ways repair - is 3pobject extern spin m_object pointer, being initialized constructor; second emanate an "interface" "factory" classes trade them...



could advise another ways solve ?



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