Working with C++ Legacy Code

This talk presents practices for adding features and fixing bugs in large, undocumented C++ codebases while reducing the risk of introducing more bugs. It demonstrates using unit tests, fakes, mocks, and templates to make difficult code testable and easier to extend.

Syllabus

Intro
No longer engineered - continuedly patched
Written by someone else
The good news and bad news
Gaining control over legacy code
This is a unit test (GTest)
A quick reality check
Sensing and Separation
The solution-fake/mock objects
Fake objects using Google Mock
Non virtual methods
Hard to inherit classes
Problem: un-fakeable methods
Using templates for injection
Faking Private and Protected Methods
Taking control of existing legacy code