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//===--- RefactoringOptionVisitor.h - Clang refactoring library -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#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
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