What is a function template?
PICTURE THIS: HOW TO EXPLAIN IT
Simple meaning
The compiler generates a function per type I call it with.
WHY — Templates instead of guessing?
Why interviewers care about Templates:
who only read docs from people who shipped.
and tied to C++ work.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1The compiler generates a
function per type I call it with.
- 2I write algorithms once
for int and string.
- 3How it works
Compilation errors get long
- 4I keep templates in
headers unless I explicitly instantiate.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
The compiler generates a function per type I call it with. I write algorithms once for int and string.