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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===- llvm/ADT/Identity.h - Provide std::identity from C++20 ---*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file provides an implementation of std::identity from C++20. |
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| 10 | // |
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| 11 | // No library is required when using these functions. |
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| 12 | // |
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| 13 | //===----------------------------------------------------------------------===// |
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| 14 | |||
| 15 | #ifndef LLVM_ADT_IDENTITY_H |
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| 16 | #define LLVM_ADT_IDENTITY_H |
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| 17 | |||
| 18 | |||
| 19 | namespace llvm { |
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| 20 | |||
| 21 | // Similar to `std::identity` from C++20. |
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| 22 | template <class Ty> struct identity { |
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| 23 | using is_transparent = void; |
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| 24 | using argument_type = Ty; |
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| 25 | |||
| 26 | Ty &operator()(Ty &self) const { |
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| 27 | return self; |
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| 28 | } |
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| 29 | const Ty &operator()(const Ty &self) const { |
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| 30 | return self; |
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| 31 | } |
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| 32 | }; |
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| 33 | |||
| 34 | } // end namespace llvm |
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| 35 | |||
| 36 | #endif // LLVM_ADT_IDENTITY_H |