compiler-rt/lib/orc/stl_extras.h

   1 //===-------- stl_extras.h - Useful STL related functions-------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file is a part of the ORC runtime support library.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef ORC_RT_STL_EXTRAS_H
  14 #define ORC_RT_STL_EXTRAS_H
  15
  16 #include <utility>
  17 #include <tuple>
  18
  19 namespace __orc_rt {
  20
  21 /// Substitute for std::identity.
  22 /// Switch to std::identity once we can use c++20.
  23 template <class Ty> struct identity {
  24   using is_transparent = void;
  25   using argument_type = Ty;
  26
  27   Ty &operator()(Ty &self) const { return self; }
  28   const Ty &operator()(const Ty &self) const { return self; }
  29 };
  30
  31 } // namespace __orc_rt
  32
  33 #endif // ORC_RT_STL_EXTRAS