lib/bitops8.cpp

The following code example is taken from the book
C++20 - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2021
The code is licensed under a Creative Commons Attribution 4.0 International License.

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// raw code

#include <iostream>
#include <format>
#include <bitset>
#include <bit>

int main()
{
  std::uint8_t i8 = 0b0000'1101;
  std::cout
    << std::format("{0:08b} {0:3}\n", i8)                 // 00001101
    << std::format("{0:08b} {0:3}\n", std::rotl(i8, 2))   // 00110100
    << std::format("{0:08b} {0:3}\n", std::rotr(i8, 1))   // 10000110
    << std::format("{0:08b} {0:3}\n", std::rotr(i8, -1))  // 00011010
    << std::format("{}\n", std::countl_zero(i8))          // four leading zeros
    << std::format("{}\n", std::countr_one(i8))           // one trailing one
    << std::format("{}\n", std::popcount(i8))             // three ones
    << std::format("{}\n", std::has_single_bit(i8))       // false
    << std::format("{0:08b} {0:3}\n", std::bit_floor(i8)) // 00001000
    << std::format("{0:08b} {0:3}\n", std::bit_ceil(i8))  // 00010000
    << std::format("{}\n", std::bit_width(i8));           // 4
}