Operator Overloading & Templates
A cross-cutting module · ← Course home · Syllabus · Glossary
⚠️ This is an advanced section
Everything before this point in the course is essential. Everything in this module is optional enrichment — the material the syllabus parks under “Modern C++ toolkit.” It assumes the whole course: classes and const (OOP module), interfaces and comparisons (Inheritance module), the standard library’s own habits (
vector,string,operator<<— met throughout). Work through it after the capstone, or in parallel with a data-structures course — not instead of finishing the 16 units.If you are still building the core skills, stop here with no guilt: Unit 16’s capstone matters more. This module will wait; it has no dependencies on being read this week.
What this module covers
| Lesson | What it covers |
|---|---|
| Lesson 1 — Operator overloading | Why overload; member vs non-member operators (the decision table); arithmetic and comparison operators; stream operators; the rules and the mistakes gallery |
| Lesson 2 — Templates | Function templates; class templates; type independence and what “generic” costs; limitations and common mistakes — honestly named |
| Practice | Exercises — 20 graded with separated solutions · Debugging — 8 seeded hunts · Design problems — 6 with separated reviews · Challenges — 8 with separated solutions |
| Labs | 5 labs — Complex numbers, Generic calculator, Generic max/min, Generic container, Student/result comparison |
Prerequisites checklist — be honest with yourself
- You can write a class with
constmember functions andoperator<<without notes (OOP module) - You can explain what a contract is between a function and the types it serves (Inheritance module)
- You have read compiler template errors before and not closed the terminal (a sense of humour counts)
The module’s three ideas
- Operators are functions.
a + bis notation for a call; overloading lets your types join the notation — subject to strict rules that keep the notation honest. - Templates are patterns for code. One function/class shape, stamped out per type by the compiler — type independence by generation, not by runtime polymorphism.
- Generic code trades control for reach. A template works for every type that meets its (implicit) requirements — and tells you nothing about unmet ones except a wall of errors. The module’s lesson is designing requirements you can name, and diagnosing the errors when they bite.
Pacing
- Session A — Lesson 1 + Exercises Part A + the Complex-number lab.
- Session B — Lesson 2 + Exercises Part B + Generic max/min and the container lab.
- Stretch — Design problems, challenges, the calculator and comparison labs.
— Engr. Dr. Muhammad Nadeem Majeed, Professor, Department of Data Science (PUCIT), University of the Punjab, Lahore · About the instructor