1. C++ support for Object-Oriented Programming
程式設計
潘仁義
CCU COMM

2. “Donut” Model of Standard Type int

3. “Donut” Model of an Abstract Data Type

4. Abstract Data Type supporting
C does not allow to define operators
Complex + Complex ?
C permits only one meaning for a name
abs( ), labs( ), llabs( ), fabs( ) ?
C++ supports Class definition
to group data structure and operations of an abstract data type
supports operator overloading
to include definitions of arithmetic and input/output operators
supports function overloading
Ex. Using only one “abs( )”

5. Comparison of Models of Standard Type int and Abstract Data Type Complex

6. Header File for Class Complex
Complex comp1;
Complex comp2( 5.1 );
Complex comp3( 9.1, -7.2);

7. Implementation File for Class Complex
“this”
Member functions can access private data member
Member operators have direct access to the members of their first operand
If member function/operator does not change data members
Prototype ends in “const”
Why?

8. Implementation File for Class Complex (cont’d)
有個bug,
猜猜在哪

9. Driver Function to Test Class Complex

10. Step-by-Step Evaluation of Multiple << Operations
ostream& operator<< (ostream& os, Complex c) { … os << fixed << showpoint << setprecision(2); … return os; }

11. Q & A Shadow copy vs. Deep copy
A shallow copy of an object copies all of the member field values
The default copy constructor and assignment operator make shallow copies
May not be what you want for fields that point to dynamically allocated memory
Deep copies need ...
Destructor
Copy constructor
Overloaded assignment operator