std function, past, present, future
summary
A concise, concrete itinerary: implements an Observer with C-style function pointers, measures std::function internals (type‑erasure metadata plus SSO buffer) and reports typical sizes as about five pointer widths and observed worst cases up to ten pointer widths, compares alternatives, and publishes code at OptimumCpp/short_function. Proposes a memory‑lean short function (mono_state-only, no dynamic allocation, size ≈ void) and a customizable line function* with user-controlled SSO, offers a CRTP function_base and template vars to eliminate UB and reduce allocations.
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chapters (7)
- 0:00Start
- 2:25Examples of free function pointers
- 9:41Consequences of variadic template proposal
- 37:06Exact signature in generic functional libraries
- 42:19function CRTP base
- 46:03Core language improvements
- 50:19Summery of proposed tools
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