[libcxx-commits] [PATCH] D103478: [libc++][compare] Implement three_way_comparable[_with] concepts

Thu Jun 3 17:34:06 PDT 2021

tcanens added a comment.

In D103478#2794869 <https://reviews.llvm.org/D103478#2794869>, @Quuxplusone wrote:

>> I was looking at how to implement compare_three_way and found out that it needs to be present in both <compare> and <functional> according to the standard draft ( <function> synopsis, <compare> synopsis).
>
> Sounds like someone should file an LWG issue. I'm not aware of any other library facilities that are listed multiple times in different places in the Standard. This might be a cut-and-paste error.

This is the new way to say "this thing is provided if you include either header": https://github.com/cplusplus/draft/issues/3683

It's very much intentional that `compare_three_way` is available if you include either `<functional>` or `<compare>`.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D103478/new/

https://reviews.llvm.org/D103478