tree 094324566c3833ece39c27c240800d428c7a226f
parent 821c2e174b79c83f91c212cb2c3a0b23e985be12
author Christopher Di Bella <cjdb@google.com> 1616352504 +0000
committer Copybara-Service <copybara-worker@google.com> 1618252136 -0700

[libcxx] moves `std::invoke` into `__functional_base`

Including `<concepts>` in other standard library headers (such as
`<iterator>`) creates circular dependencies due to `<functional>`.
Since `<concepts>` only needs `std::invoke` from `<functional>`, the
easiest, fastest, and cleanest way to eliminate the circular dep is to
move `std::invoke` into `__functional_base`.

This has the added advantage of `<concepts>` not transitively importing
`<functional>`.

Differential Revision: https://reviews.llvm.org/D99041

GitOrigin-RevId: c25c22d5f9b7e56c0c350982b5ec41095c5a0a05