What is noexcept and why mark move constructors?
PICTURE THIS: HOW TO EXPLAIN IT
Simple meaning
noexcept tells the compiler the function will not throw.
WHY — Errors instead of guessing?
Why interviewers care about Errors:
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:
- 1noexcept tells the compiler
the function will not throw.
- 2vector can move elements
on reallocation only if moves are noexcept
- 3How it works
otherwise it copies.
- 4Give an example
I mark non-throwing moves.
- 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
noexcept tells the compiler the function will not throw. vector can move elements on reallocation only if moves are noexcept