1 //===- Optional.h - Simple variant for passing optional values --*- 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 /// \file 10 /// This file provides Optional, a template class modeled in the spirit of 11 /// OCaml's 'opt' variant. The idea is to strongly type whether or not 12 /// a value can be optional. 13 /// 14 //===----------------------------------------------------------------------===// 15 16 #ifndef LLVM_ADT_OPTIONAL_H 17 #define LLVM_ADT_OPTIONAL_H 18 19 #include <optional> 20 21 namespace llvm { 22 // Legacy alias of llvm::Optional to std::optional. 23 // FIXME: Remove this after LLVM 16. 24 template <class T> using Optional = std::optional<T>; 25 } // namespace llvm 26 27 #endif // LLVM_ADT_OPTIONAL_H 28