Standard library header <bit> (C++20) - cppreference.com
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    Standard library header <bit> (C++20)

    From cppreference.com
     
    C++
     
    Standard library headers
     

    This header is part of the general utilities library, and provides facilities to access, process and manipulate both individual bits and bit sequences.

    Synopsis

    namespace std {
  // bit_cast
  template<class To, class From>
    constexpr To bit_cast(const From& from) noexcept;

  // byteswap
  template <class T>
    constexpr T byteswap(T value) noexcept;

  // integral powers of 2
  template<class T>
    constexpr bool has_single_bit(T x) noexcept;
  template<class T>
    constexpr T bit_ceil(T x);
  template<class T>
    constexpr T bit_floor(T x) noexcept;
  template<class T>
    constexpr int bit_width(T x) noexcept;

  // shifting
  template<class T, class S>
    constexpr T shl(T x, S s) noexcept;
  template<class T, class S>
    constexpr T shr(T x, S s) noexcept;

  // rotating
  template<class T>
    constexpr T rotl(T x, int s) noexcept;
  template<class T>
    constexpr T rotr(T x, int s) noexcept;

  // counting
  template<class T>
    constexpr int countl_zero(T x) noexcept;
  template<class T>
    constexpr int countl_one(T x) noexcept;
  template<class T>
    constexpr int countr_zero(T x) noexcept;
  template<class T>
    constexpr int countr_one(T x) noexcept;
  template<class T>
    constexpr int popcount(T x) noexcept;

  // permutation
  template<class T>
    constexpr T bit_reverse(T x) noexcept;
  template<class T>
    constexpr T bit_repeat(T x, int l);
  template<class T>
    constexpr T bit_compress(T x, T m) noexcept;
  template<class T>
    constexpr T bit_expand(T x, T m) noexcept;

  // endian
  enum class endian {
    little = /* see description */,
    big    = /* see description */,
    native = /* see description */
  };
}