Expert · Module 13 · Lesson 6 of 6
Polymorphic Allocators: std::pmr in Real Containers
Route many standard containers through a memory resource, choose monotonic or pooled storage deliberately, and keep resource lifetimes valid.
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By the end you can
- Explain the difference between an allocator-aware container and a memory resource
- Choose a pmr resource for bounded or short-lived allocation patterns
- Track resource lifetime and fallback behavior
Builds on A Pool Allocator for Fixed-Size Nodes.
01 · A question first
A request builds thousands of short-lived strings and vectors, then destroys them together. Individual new calls dominate the profile. How can standard containers share an arena without rewriting their element type or pretending the arena owns more than it does?
Make a guess before you read on.
02 · The idea
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What's inside
- Start with the problem
- How the idea works
- Why it is correct
- What it costs
- Pitfalls and variations
- Production guidance
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