BasicSum.h

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//
// Copyright 2015 - 2024 (C). Alex Robenko. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 
#pragma once
 
#include <cstdint>
 
namespace comms
{
 
namespace protocol
{
 
namespace checksum
{
 
template <typename TResult = std::uint8_t, TResult TInitValue = 0>
class BasicSum
{
public:
    template <typename TIter>
    TResult operator()(TIter& iter, std::size_t len) const
    {
        using ByteType = typename std::make_unsigned<
            typename std::decay<decltype(*iter)>::type
        >::type;
 
        TResult checksum = TInitValue;
        for (auto idx = 0U; idx < len; ++idx) {
            checksum = static_cast<TResult>(checksum + static_cast<ByteType>(*iter));
            ++iter;
        }
        return checksum;
    }
};
 
}  // namespace checksum
 
}  // namespace protocol
 
}  // namespace comms