From faabefe3c8a4755249e75cf8e2d3726460887946 Mon Sep 17 00:00:00 2001 From: Lang Hames Date: Fri, 26 Aug 2022 15:32:17 -0700 Subject: [PATCH] [ORC-RT] Add a std::identity substitute. The __orc_rt::identity utility is intended to serve as a substitute for c++20's std::identity until we can use the latter (when LLVM moves to c++20). --- compiler-rt/lib/orc/stl_extras.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/compiler-rt/lib/orc/stl_extras.h b/compiler-rt/lib/orc/stl_extras.h index ad7286e..e4f8bf0 100644 --- a/compiler-rt/lib/orc/stl_extras.h +++ b/compiler-rt/lib/orc/stl_extras.h @@ -41,6 +41,16 @@ decltype(auto) apply_tuple(F &&f, Tuple &&t) { Indices{}); } +/// Substitute for std::identity. +/// Switch to std::identity once we can use c++20. +template struct identity { + using is_transparent = void; + using argument_type = Ty; + + Ty &operator()(Ty &self) const { return self; } + const Ty &operator()(const Ty &self) const { return self; } +}; + } // namespace __orc_rt #endif // ORC_RT_STL_EXTRAS -- 2.7.4