// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you 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 <cassert>

#include <cstddef>

#include <cstdint>

#include <string_view>

#include <vector>

namespace doris::snii {

// Read-only byte view (does not own memory). Lifetime is managed by the underlying buffer.

class Slice {

public:

    Slice() = default;

    Slice(const uint8_t* d, size_t n) : data_(d), size_(n) {}

    explicit Slice(const std::vector<uint8_t>& v) : data_(v.data()), size_(v.size()) {}

    explicit Slice(std::string_view sv)

            : data_(reinterpret_cast<const uint8_t*>(sv.data())), size_(sv.size()) {}

    const uint8_t* data() const { return data_; }

    size_t size() const { return size_; }

    bool empty() const { return size_ == 0; }

    uint8_t operator[](size_t i) const {

        assert(i < size_);

        return data_[i];

    }

    Slice subslice(size_t off, size_t n) const {

        assert(off + n <= size_);

        return Slice(data_ + off, n);

    }

private:

    const uint8_t* data_ = nullptr;

    size_t size_ = 0;

};

} // namespace doris::snii