Hi,
I have a very dumb basic query .. while overloading assignment operator what
we do we check for self referentiality (if both are same or not) and if not ,
then we delete the pointer member variable and allocate memory for it again and
assign value. (Please correct me if I am wrong) .. My query is , why do we need
to delete the existing memory and again to allocate instead of using the
existing one itself.
My example code:
//--- file Person.h
. . .
class Person {
private:
char* _name;
int _id;
public:
Person& Person::operator=(const Person& p);
. . .
}//--- file Person.cpp
. . .
//=================================================== operator=
Person& Person::operator=(const Person& p) {
if (this != &p) { // make sure not same object
delete [] _name; // Delete old name's memory. //
why do I need to do this? cant I use the exisitng memory itself?
_name = new char[strlen(p._name)+1]; // Get new space
strcpy(_name, p._name); // Copy new name
_id = p._id; // Copy id
}
return *this; // Return ref for multiple assignment
}//end operator= Thx,--Gopi
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