[libc++] Introduce preliminary relocation primitives #156903
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This patch introduces the following utilities around relocation: - __relocate_at, which relocates a single object - a __is_nothrow_relocatable trait - __uninitialized_relocate and __uninitialized_relocate_backward - allocator-aware variants of all of those These facilities are preliminary work towards implementing https://wg21.link/p3516, which has been design-approved but not yet voted into the Standard. This patch is careful not to introduce any new public names officially, since the TR APIs are still expected to undergo changes in the C++26 cycle. The reason for wanting to land this patch is that it will allow reworking the implementation of vector to take advantage of relocation in more cases, while being consistent with the ongoing and future direction of trivial relocation in the Standard.
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This is missing tests and I think there was a bug hidden somewhere when I last looked at it. |
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This patch introduces the following utilities around relocation:
These facilities are preliminary work towards implementing https://wg21.link/p3516, which has been design-approved but not yet voted into the Standard. This patch is careful not to introduce any new public names officially, since the TR APIs are still expected to undergo changes in the C++26 cycle.
The reason for wanting to land this patch is that it will allow reworking the implementation of vector to take advantage of relocation in more cases, while being consistent with the ongoing and future direction of trivial relocation in the Standard.