C++ access class private attribute friend funcion with (void * callerobj) parameter -

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i have class called sender private attribute issending , friend function sending. inside friend function, want access issending attribute

class sender{     private:     issending=false;     friend void* sending (void * callerobj); }  void* sending (void * callerobj){     while(<issending true>){      } }

i've tried

callerobj->issending callerobj.issending

but got compile error. how can access issending friend function (void * callerobj) parameter?

since type of callerobj void*, cannot use access member data or member function. after all, original object int*.

if sure original object sender*, can cast callerobj sender* , use access member data.

sender* senderobj = reinterpret_cast<sender*>(callerobj); if ( senderobj != nullptr ) {    while ( senderobj->issending )    {       ...    } }

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