c++ - avoiding duplication in the assignment operator of a derived class -

consider assignment operators in classes parent , child, below.

#include <iostream> class parent  { public:   parent(){};   virtual ~parent(){};   parent& operator=(const parent& other){mp = other.mp; return *this;};    void setp(double inp){mp = inp;};   double getp(){return mp;}; protected:   double mp; };   class child : public virtual parent { public:   child(){};   virtual ~child(){};   child& operator=(const child& other)   {      mc = other.mc;      mp = other.mp;// line      return *this;   };    void setc(double inc){mc = inc;};   double getc(){return mc;}; protected:   double mc; }; 

is here way avoid duplicate line mp = other.mp;?

the reason asking number of bases higher , inheritance structure gets more complicated, easy lose track of members.

edit

the reason need implement operator= needs check things before assignments.

just call parent operator:

child& operator=(const child& other) {      mc = other.mc;      parent::operator=(other);      return *this; } 

or really, don't implement either operator since both trivial!