llvm/clang/include/clang/Basic/DirectoryEntry.h

//===- clang/Basic/DirectoryEntry.h - Directory references ------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Defines interfaces for clang::DirectoryEntry and clang::DirectoryEntryRef.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_BASIC_DIRECTORYENTRY_H
#define LLVM_CLANG_BASIC_DIRECTORYENTRY_H

#include "clang/Basic/CustomizableOptional.h"
#include "clang/Basic/LLVM.h"
#include "llvm/ADT/DenseMapInfo.h"
#include "llvm/ADT/Hashing.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/ErrorOr.h"

#include <optional>
#include <utility>

namespace clang {
namespace FileMgr {

template <class RefTy> class MapEntryOptionalStorage;

} // end namespace FileMgr

/// Cached information about one directory (either on disk or in
/// the virtual file system).
class DirectoryEntry { … };

/// A reference to a \c DirectoryEntry  that includes the name of the directory
/// as it was accessed by the FileManager's client.
class DirectoryEntryRef { … };

OptionalDirectoryEntryRef;

namespace FileMgr {

/// Customized storage for refs derived from map entires in FileManager, using
/// the private optional_none_tag to keep it to the size of a single pointer.
template <class RefTy> class MapEntryOptionalStorage { … };

} // end namespace FileMgr

namespace optional_detail {

/// Customize OptionalStorage<DirectoryEntryRef> to use DirectoryEntryRef and
/// its optional_none_tag to keep it the size of a single pointer.
template <>
class OptionalStorage<clang::DirectoryEntryRef>
    : public clang::FileMgr::MapEntryOptionalStorage<clang::DirectoryEntryRef> { … };

static_assert …;

static_assert …;

} // end namespace optional_detail
} // namespace clang

namespace llvm {

template <> struct PointerLikeTypeTraits<clang::DirectoryEntryRef> { … };

/// Specialisation of DenseMapInfo for DirectoryEntryRef.
template <> struct DenseMapInfo<clang::DirectoryEntryRef> { … };

} // end namespace llvm

#endif // LLVM_CLANG_BASIC_DIRECTORYENTRY_H