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 19namespace __orc_rt { 20 21/// Substitute for std::identity. 22/// Switch to std::identity once we can use c++20. 23template <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 34