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14.3

Memberwise Assignment. 14.3. Memberwise Assignment. Can use = to assign one object to another, or to initialize an object with an object ’ s data Copies member to member. e.g. , instance2 = instance1; means:

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14.3

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  1. Memberwise Assignment 14.3

  2. Memberwise Assignment • Can use = to assign one object to another, or to initialize an object with an object’s data • Copies member to member. e.g., instance2 = instance1; means: copy all member values from instance1 and assign to the corresponding member variables of instance2 • Use at initialization: Rectangle r2 = r1;

  3. Declare the Class my_string class MyString{ public: MyString(int n); MyString(const char * str); ~ MyString(); int length() const ; //const member function void print() const; private: char * s; int len; };

  4. // // Assignment of a Mystring into another Mystring // Mystring& Mystring::operator=(const Mystring& mstr) { // ("Mystring assignment operator”) if (&mstr == this) { //("Not copying myself"); return *this; } // Delete the old string that this class was holding. delete [] s; // Allocate enough space for the new string. s = new char[mstr.length() + 1]; // Copy the new string into myself strcpy(s, mstr.s); // Return myself return *this; }

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