mutable_static_binary_view.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>
 
namespace msgpack_light::details {

template <std::size_t N>
class mutable_static_binary_view {
public:
    explicit mutable_static_binary_view(unsigned char* buffer) noexcept
        : buffer_(buffer) {}

    unsigned char& operator[](std::size_t index) noexcept {
        return buffer_[index];
    }

    unsigned char operator[](std::size_t index) const noexcept {
        return buffer_[index];
    }

    unsigned char* data() noexcept { return buffer_; }

    [[nodiscard]] std::size_t size() const noexcept { return N; }

    template <std::size_t Start, std::size_t Size = N - Start>
    [[nodiscard]] mutable_static_binary_view<Size> sub_buffer() const noexcept {
        static_assert(Start <= N);
        static_assert(Start + Size <= N);
        return mutable_static_binary_view<Size>(buffer_ + Start);
    }
 
private:
    unsigned char* buffer_;
};
 
}  // namespace msgpack_light::details