Core · Module 8 · Lesson 3 of 5

Exception Safety: Guarantees and RAII Discipline

Promise basic, strong, or nothrow safety for mutating operations, and use RAII plus copy-and-swap to keep state coherent when throws occur.

ProAbout 10 minutes

By the end you can

Distinguish basic, strong, and nothrow guarantees with examples
Write mutating operations that stay coherent under exceptions
Mark destructors and moves noexcept to protect unwinding

Builds on Standard Exceptions and Custom Exception Types.

01 · A question first

A bulk import adds forty books, throws on the forty-first, and leaves half the catalog updated with no record of what succeeded. Restarting duplicates entries; rolling back by hand misses one. What promise should the import have made so callers know exactly what a failure leaves behind?

Make a guess before you read on.

02 · The idea

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What's inside

Why success-or-nothing matters
How RAII plus a side copy delivers strength
Why nothrow operations anchor the system
What it costs and where strength slips
How to review a function for strength
Where it is used