How do you handle out-of-memory?
PICTURE THIS: HOW TO EXPLAIN IT
IdeaMemory
HowWhat happens inside
Why they askShows real use
Simple meaning
new can throw bad_alloc
WHY — Memory instead of guessing?
Why interviewers care about Memory:
This is a process
question about Memory.
Panels listen for order,
trade-offs, and what you would actually do on a C++ project - not buzzwords.
Stay structured
Name the idea, why it exists, then one short example.
Close cleanly
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:
- 1Define it
new can throw bad_alloc
- 2Why it exists
nothrow new returns nullptr.
- 3How it works
Critical systems preallocate.
- 4Catching OOM is not
always recoverable.
- 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:
Say this line
“Critical systems preallocate.”
Break into beats
Criticalsystemspreallocate
Speaking order
29874083374
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
new can throw bad_alloc nothrow new returns nullptr.