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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-exception6//7//===----------------------------------------------------------------------===//8//9// This file is a part of the ORC runtime support library.10//11//===----------------------------------------------------------------------===//12 13#ifndef ORC_RT_STL_EXTRAS_H14#define ORC_RT_STL_EXTRAS_H15 16#include <cstdint>17#include <utility>18#include <tuple>19 20namespace orc_rt {21 22/// Substitute for std::identity.23/// Switch to std::identity once we can use c++20.24template <class Ty> struct identity {25 using is_transparent = void;26 using argument_type = Ty;27 28 Ty &operator()(Ty &self) const { return self; }29 const Ty &operator()(const Ty &self) const { return self; }30};31 32/// Substitute for std::bit_ceil.33constexpr uint64_t bit_ceil(uint64_t Val) noexcept {34 Val |= (Val >> 1);35 Val |= (Val >> 2);36 Val |= (Val >> 4);37 Val |= (Val >> 8);38 Val |= (Val >> 16);39 Val |= (Val >> 32);40 return Val + 1;41}42 43} // namespace orc_rt44 45#endif // ORC_RT_STL_EXTRAS46