[llvm-branch-commits] [libcxx] [libc++] Implement std::move_only_function (P0288R9) (PR #94670)

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huixie90 wrote:

As the standard is moving towards `constexpr` everything and there is a paper P3574 which proposes to make `move_only_function` and `copyable_function` `constexpr`.  (also in my proposal of `any_view` which is another type erasure wrapper for ranges, SG9 also directed us to make it `constexpr` directly). Given above, I would suggest to investigate how easy is to make this implementation `constexpr`. 

https://github.com/llvm/llvm-project/pull/94670