| //===--- RefactoringOptionVisitor.h - Clang refactoring library -----------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_CLANG_TOOLING_REFACTOR_REFACTORING_OPTION_VISITOR_H |
| #define LLVM_CLANG_TOOLING_REFACTOR_REFACTORING_OPTION_VISITOR_H |
| |
| #include "clang/Basic/LLVM.h" |
| #include <type_traits> |
| |
| namespace clang { |
| namespace tooling { |
| |
| class RefactoringOption; |
| |
| /// An interface that declares functions that handle different refactoring |
| /// option types. |
| /// |
| /// A valid refactoring option type must have a corresponding \c visit |
| /// declaration in this interface. |
| class RefactoringOptionVisitor { |
| public: |
| virtual ~RefactoringOptionVisitor() {} |
| |
| virtual void visit(const RefactoringOption &Opt, |
| Optional<std::string> &Value) = 0; |
| }; |
| |
| namespace traits { |
| namespace internal { |
| |
| template <typename T> struct HasHandle { |
| private: |
| template <typename ClassT> |
| static auto check(ClassT *) -> typename std::is_same< |
| decltype(std::declval<RefactoringOptionVisitor>().visit( |
| std::declval<RefactoringOption>(), *std::declval<Optional<T> *>())), |
| void>::type; |
| |
| template <typename> static std::false_type check(...); |
| |
| public: |
| using Type = decltype(check<RefactoringOptionVisitor>(nullptr)); |
| }; |
| |
| } // end namespace internal |
| |
| /// A type trait that returns true iff the given type is a type that can be |
| /// stored in a refactoring option. |
| template <typename T> |
| struct IsValidOptionType : internal::HasHandle<T>::Type {}; |
| |
| } // end namespace traits |
| } // end namespace tooling |
| } // end namespace clang |
| |
| #endif // LLVM_CLANG_TOOLING_REFACTOR_REFACTORING_OPTION_VISITOR_H |