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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.

Types

(C++20)
 indicates the endianness of scalar types
(enum) [edit]

Functions

(C++20)
 reinterpret the object representation of one type as that of another
(function template) [edit]
(C++23)
 reverses the bytes in the given integer value
(function template) [edit]
(C++20)
 checks if a number is an integral power of 2
(function template) [edit]
(C++20)
 finds the smallest integral power of 2 not less than the given value
(function template) [edit]
(C++20)
 finds the largest integral power of 2 not greater than the given value
(function template) [edit]
(C++20)
 finds the smallest number of bits needed to represent the given value
(function template) [edit]
(C++29)
 shifts to the left without the possibility of undefined behavior
(function template) [edit]
(C++29)
 shifts to the right without the possibility of undefined behavior
(function template) [edit]
(C++20)
 computes the result of bitwise left-rotation
(function template) [edit]
(C++20)
 computes the result of bitwise right-rotation
(function template) [edit]
(C++20)
 counts the number of consecutive 0 bits, starting from the most significant bit
(function template) [edit]
(C++20)
 counts the number of consecutive 1 bits, starting from the most significant bit
(function template) [edit]
(C++20)
 counts the number of consecutive 0 bits, starting from the least significant bit
(function template) [edit]
(C++20)
 counts the number of consecutive 1 bits, starting from the least significant bit
(function template) [edit]
(C++20)
 counts the number of 1 bits in an unsigned integer
(function template) [edit]
(C++29)
 reverses the bits in an integer
(function template) [edit]
(C++29)
 repeats/broadcasts a bit pattern of specified length
(function template) [edit]
(C++29)
 compresses bits of an operand using a mask (PEXT)
(function template) [edit]
(C++29)
 expands bits from an operand using a mask (PDEP)
(function template) [edit]

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 */
  };
}