c++ - Overload + operator for integer array, What's difference between two function const and without const at right? -


this class of array access array of integerset. need access pointer ptr of integerset getptr();

you need access capacity of integerset getcapacity();

getptr() const const integerset class. 

class integerset {  private:     int capacity;     int nelements;     int * ptr; public : integerset(int  size); ~integerset(); int * getptr() const {return ptr;}; int getcapacity() const {return capacity;}; integerset &  operator =(const integerset & rhs1); friend integerset  operator +(const integerset & rhs1,const integerset & rhs2); };  integerset::integerset(int  size) { ptr=null; capacity = size; ptr = new int [capacity]; if(ptr==null) cout << "error allocation"<< endl;  } ~integerset() { if (ptr) delete ptr; } integerset & integerset::operator =(const integerset & rhs1) { int capacity_=rhs1.getcapacity(); int *rptr1=rhs1.getptr(); (int i=0;i<capacity_;i++) { ptr[i]=rptr1[i]; // ptr pointer of class integerset  } return *this; }  //this function friend of class integerset extern .. integerset  operator +(const integerset & rhs1,const int& rhs2) { int capacity_=rhs1.getcapacity(); integerset  temp(capacity_); int *rptr1=rhs1.getptr(); int *tptr=temp.getptr(); (int i=0;i<capacity_;i++) { tptr[i]=rptr1[i]+rhs2; } return temp; }

what's difference between 2 function int * getptr() const , int * getptr(); ?


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