Jake Hillion 89b230395f tbv2: remove unnecessary copy in Element (#457) ... Summary: tbv2: remove unnecessary copy in Element `IntrospectionResult::const_iterator` iterates through the `Element`s in an `IntrospectionResult`. `Element` currently copies the `type_path` which is a `std::vector<string_view>` every time the iterator is incremented. This is unnecessary as the data in the vector only changes slightly between iterations. This change changes the `type_path` field in `Element` to a `std::span<const std::string_view>`. Doing this previously caused SEGVs because of the iterator's potential to be copied. To make it possible we do two things: 1. Make all copies explicit using a clone interface as in `ContainerInfo`. This prevents accidental copies of an expensive structure. 2. After calling the copy constructor in `clone()` update the `span` in `next_` to point at the newly copied structure. Moves are fine because the `span` points at the allocation of the `vector`, not the vector itself. Test Plan: - CI - `FILTER='OilIntegration.*' make test` - Ran `OilgenIntegration.std_vector_vector_int_some` which SEGVd with the `span` change before and now doesn't. This now passes cleanly with ASAN enabled on the target, though isn't available in `main` (only works on my machine). Differential Revision: D53472595 Pulled By: JakeHillion		2024-02-07 07:51:22 -08:00
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oi	tbv2: remove unnecessary copy in Element (#457)	2024-02-07 07:51:22 -08:00