commit 18b94b517d808bfaf8ba1559c45de61b403ff52a
author Ho Cheung <hocheung@chromium.org> Sat Jan 25 12:59:55 2025
committer WebRTC LUCI CQ <webrtc-scoped@luci-project-accounts.iam.gserviceaccount.com> Fri Jan 31 13:31:32 2025
tree 01adf30ec6de6f18aa50ac49dc9f2b2bfca6972d
parent de1735058bc2e170af452e18b293ba44bb2b86a7

[rtc_base] Replace manual element initialization and movement with C++17 standard functions

This CL focuses on addressing the remaining TODO items in the
`//rtc_base/bounded_inline_vector_impl.h` file, mainly involving the two
functions `void DefaultInitializeElements` and `void MoveElements`.

In the `void DefaultInitializeElements` function, the placement new usage is
adopted. When using placement new, manual construction operations on objects are
usually required, and a fair amount of logic needs to be written to ensure
correct object construction. In contrast, the
`std::uninitialized_default_construct_n()` function only requires passing in the
starting address of the memory and the number of objects to be constructed, and
it can automatically construct objects in batches.

In the `void MoveElements` function, the original implementation also uses the
placement new usage. When using placement new to move objects, manual handling
of the moving operation for each object is required, and usually, `std::move`
needs to be combined to achieve the object's move semantics. However, the
`std::uninitialized_move_n()` function can automatically complete the object
moving process just by passing in specific parameters.

To improve the code's simplicity, it is considered to use
`std::uninitialized_default_construct_n()` and `std::uninitialized_move_n()` to
replace the original two placement new usages.

Fixed: webrtc:392037564
Change-Id: If8edcd9ac8a4d85be0ce0a23f6433d7f91b39ad3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/375182
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Auto-Submit: Ho Cheung <hocheung@chromium.org>
Cr-Commit-Position: refs/heads/main@{#43831}