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  1. //===- llvm/ADT/Identity.h - Provide std::identity from C++20 ---*- 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 provides an implementation of std::identity from C++20.
  10. //
  11. // No library is required when using these functions.
  12. //
  13. //===----------------------------------------------------------------------===//
  14.  
  15. #ifndef LLVM_ADT_IDENTITY_H
  16. #define LLVM_ADT_IDENTITY_H
  17.  
  18.  
  19. namespace llvm {
  20.  
  21. // Similar to `std::identity` from C++20.
  22. template <class Ty> struct identity {
  23.   using is_transparent = void;
  24.   using argument_type = Ty;
  25.  
  26.   Ty &operator()(Ty &self) const {
  27.     return self;
  28.   }
  29.   const Ty &operator()(const Ty &self) const {
  30.     return self;
  31.   }
  32. };
  33.  
  34. } // end namespace llvm
  35.  
  36. #endif // LLVM_ADT_IDENTITY_H
  37.