CPSC 421-020 Object-Oriented Programming Spring 2026

Week 13 Class 20 Tue Apr 07 Posted: Apr 07

After Class

• Exercise 76: FileIO Posted the invitation link in Brightspace
• Project 4 The additional file, file renames, and build changes for the tag handler are now in a pull request. Contact me if there are any issues.

Announcements

• Project 3 I uploaded all issues for Project 3. No scores yet, and no feedback on the diagrams yet.

• Exercise 71: Static Dispatch

  Feedback is in the file oracle.txt in the branch feedback in your repository. The file oracle.txt is the difference between the oracle (with the correct answers) and your Base.cpp. If the oracle.txt is empty, then that means your answer is correct (reflected in your score). Even if your answer is correct the oracle.txt may show some differences. The differences were manually examined and I used more direct techniques to determine if there were any dynamic dispatch in your answer.

  There is a strong possibility that this will be in a question on the Final Exam.

• Exercise 64: Names Score in Brightspace. Feedback in Report.md in the branch feedback. There is a strong possibility that this will be in a question on the Final Exam.

Agenda

• Exercise 72: Names II

  Using the feedback in the Report.md, fix your Names code.

  If you have no changes to make (based on the feedback), leave the code alone.

• Exercise 73: Dynamic Dispatch

  The repository Base has a set of various method call situations, and a way at run time (using assert()) to verify which method is actually called.

  • If the call is performed using dynamic dispatch then complete the assert() in the code that indicates (via a string) which method is called, e.g., for m2() is it "Base::m2()", "Derived::m2()", or "DerivedDerived::m2()"?
  • If the call is performed using static dispatch then comment out the assert(), e.g.,

  Handle each assertion one at a time in order, compiling and running the program (i.e., make run) after each assertion is completed. The assertion you edited should pass, and you should be onto the next assertion.

  You are required to commit for each block of statements in the main program.

• Notes: Design Pattern Template Method
• Exercise 74: Design Pattern Template Method Crossword
• Project 4
• Exercise 75: VTable Diagram Due by 3:30 pm on Fri, Apr 10
• Notes: Virtual Destructors
• Exercise 76: FileIO Due by 3:30 pm on Fri, Apr 10
• Demo: Too many open files
• Notes: rValue References

Unless otherwise noted, exercises are due by 3:30 pm on Wed Apr 08