folly/folly/container/detail/BitIteratorDetail.h

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <iterator>
#include <type_traits>

#include <boost/iterator/iterator_adaptor.hpp>

#include <folly/portability/SysTypes.h>

namespace folly {

template <class BaseIter>
class BitIterator;

namespace bititerator_detail {

// Reference to a bit.
// Templatize on both parent reference and value types to capture
// const-ness correctly and to work with the case where Ref is a
// reference-like type (not T&), just like our BitReference here.
template <class Ref, class Value>
class BitReference { … };

template <class BaseIter>
struct BitIteratorBase { … };

} // namespace bititerator_detail
} // namespace folly