LLVM 20.0.0git
identity.h
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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
19namespace llvm {
20
21// Similar to `std::identity` from C++20.
22template <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
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
Ty argument_type
Definition: identity.h:24
const Ty & operator()(const Ty &self) const
Definition: identity.h:29
void is_transparent
Definition: identity.h:23
Ty & operator()(Ty &self) const
Definition: identity.h:26