map_iterator.h

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/*
 * Copyright 2024 MusicScience37 (Kenta Kabashima)
 *
 * 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 <cstddef>
#include <utility>
 
#include "msgpack_light/details/allocator_wrapper.h"
#include "msgpack_light/details/object_data.h"
#include "msgpack_light/details/object_ref_decl.h"
#include "msgpack_light/standard_allocator.h"
 
namespace msgpack_light {

template <typename Allocator = standard_allocator>
class mutable_map_iterator {
public:
    using difference_type = std::ptrdiff_t;

    using value_type =
        std::pair<mutable_object_ref<Allocator>, mutable_object_ref<Allocator>>;

    using reference = value_type;

    mutable_map_iterator() noexcept : pointer_(nullptr), allocator_(nullptr) {}

    mutable_map_iterator(details::key_value_pair_data* pointer,
        details::allocator_wrapper<Allocator>* allocator) noexcept
        : pointer_(pointer), allocator_(allocator) {}

    std::pair<mutable_object_ref<Allocator>, mutable_object_ref<Allocator>>
    operator*() const noexcept;

    mutable_map_iterator& operator++() noexcept {
        ++pointer_;
        return *this;
    }

    const mutable_map_iterator  // NOLINT(readability-const-return-type)
    operator++(int) noexcept {
        mutable_map_iterator copy{*this};
        ++(*this);
        return copy;
    }
 
private:
    details::key_value_pair_data* pointer_;

    details::allocator_wrapper<Allocator>* allocator_;
};

class const_map_iterator {
public:
    using difference_type = std::ptrdiff_t;

    using value_type = std::pair<const_object_ref, const_object_ref>;

    using reference = value_type;

    const_map_iterator() noexcept : pointer_(nullptr) {}

    explicit const_map_iterator(
        const details::key_value_pair_data* pointer) noexcept
        : pointer_(pointer) {}

    std::pair<const_object_ref, const_object_ref> operator*() const noexcept;

    const_map_iterator& operator++() noexcept {
        ++pointer_;
        return *this;
    }

    const const_map_iterator  // NOLINT(readability-const-return-type)
    operator++(int) noexcept {
        const_map_iterator copy{*this};
        ++(*this);
        return copy;
    }
 
private:
    const details::key_value_pair_data* pointer_;
};
 
}  // namespace msgpack_light