RefactoringOptionVisitor.h

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//===--- 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