Lab 9
10/30 @ 11:59 PM
Not accepted late
Note: this is lab 9, even though we're in week 10. The difference is because of the week(s) where no lab was held.
The Lab Assignment

This task will involve understanding the use way in which virtual method dispatch works, and how it is implemented. Answer the following questions:

  1. Why aren't all functions made virtual in C++?
  2. What is a vtable?
  3. What is name mangling?
  4. Write an example program that does not mangle its member function names
  5. Give an example of a program that does mangle its member function.
  6. Use g++ to get the mangled name of a function in your program. What is the mangled name?
  7. Use c++filt to get the de-mangled name of the function in your program. What is the demangled name?
Submission Instructions

Create a tarball consisting of a single directory with all of your work in it, such as code or written answers. If you have any auxiliary files (READMEs, Makefiles, etc.), be sure to include those as well. Name your work directory l9 and name the tarball l9.tgz. Upload your tarball to the L9 Canvas assignment.

Labs will be graded under one of following criteria:

  1. Effort: You will automatically be given full credit for the labwork if the GTA determines that your participation in the lab was meaningful - i.e. you attended the lab session and used the time to make a good-faith attempt to complete the work. It is the sole discretion of the GTA to determine if you put in sufficient effort. Even if you expect an effort-based grade, you should turn in your (possibly incomplete) work.
  2. Correctness: If you do not participant meaningfully in lab (i.e. you do not attend the lab session), your grade will be assessed based on the correctness of your lab submission.

Advice: How to Approach Labs

The two-criteria grading scheme above is designed to avoid wasting your time. You should not feel obligated to attend the lab, and in fact should only do so if you want help from the GTA on the labwork assignment or whatever project is currently in progress. Here's a handy flowchart for how I suggest you approach lab: