Some bit manipulations

 This C++ code has bits access routines to get and set some bits:

dataBits.h:

#include <cstdint>

#include <iostream>

template <typename T>

class DataBits

{

public:

DataBits(T v=0) : m_data(v) {};

        

        T get() const { return m_data; }

        void set(T v) { m_data = v; }

        // 0-based

        template <typename TB>

static constexpr TB BitMask(int startpos, int endpos)

{

return TB((1<<(endpos-startpos+1))-1) << startpos;

        }

        constexpr T GetBits(int startpos, int endpos)

        {

            return (m_data & BitMask<T>(startpos, endpos)) >> startpos;

        }

        void SetBits(int startpos, int endpos, T newData)

        {

            auto mask = BitMask<T>(startpos, endpos);

            m_data = (m_data & ~mask) | ((newData << startpos) & mask);

        }

private:

    T  m_data;

};

main.cpp:

#include <iostream>

#include <format>

#include <bitset>

#include <iomanip>

#include "dataBits.h"

int main()

{

    std::cout << std::format("{:#04x}", 0x0e) << std::endl;

    std::cout << "BitMask[1..3] = " << std::hex << "0x" << DataBits<uint32_t>::BitMask<uint32_t>(1,3) << std::endl;

    DataBits bits = 0b1110101001010011;

    std::cout << "bits = " << std::setw(55) << std::bitset<32>(bits.get()) << std::endl;

    auto newbits = 0b010;

    bits.SetBits(13, 15, newbits);

    std::cout << "bits with bits[13..15]=" << std::bitset<3>(newbits) << " -> " << std::bitset<32>(bits.get()) << std::endl;

    std::cout << "BitMask[1..3] = " << std::hex << "0x" << DataBits<uint32_t>::BitMask<uint32_t>(1,3) << std::endl;

    std::cout << "data @bits[13..15] = " << std::bitset<3>(bits.GetBits(13,15)) << std::endl;

    return 0;

}