[PATCH] Deprecate std::get_temporary_buffer

[Jonathan Wakely]

This was deprecated in C++17, and has been removed from the current
draft. This adds the dprecated attribute for C++17 and later.

We can't actually remove it for C++2a because we use it (indirectly)
in stl_algo.h. We could rename it to __get_temporary_buffer for our
internal uses, and then add back get_temporary_buffer as a simple
forwarding function guarded by:

#if __cplusplus <= 201703L || _GLIBCXX_USE_DEPRECATED

This patch doesn't do that though.

Does anybody object to adding the deprecated attribute here?

Does anybody want to argue in favour of completely removing it for
C++2a?


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