<bit>

Defines functions to access, manipulate, and process individual bits and sequences of bits.

For example, there are functions to rotate bits, find the number of consecutive set or cleared bits, see if a number is an integral power of two, find the smallest number of bits to represent a number, and so on.

Requirements

Header: <bit>

Namespace: std

/std:c++20 or later is required.

Members

Types

Type	Description
endian	Specifies the endianness of scalar types.

Functions

Function	Description
bit_cast	Reinterpret the object representation from one type to another.
bit_ceil	Find the smallest power of two greater than or equal to a value.
bit_floor	Find the largest integral power of two not greater than a value.
bit_width	Find the smallest number of bits needed to represent a value.
countl_zero	Count the number of consecutive bits set to zero, starting from the most significant bit.
countl_one	Count the number of consecutive bits set to one, starting from the most significant bit.
countr_zero	Count the number of consecutive bits set to zero, starting from the least significant bit.
countr_one	Count the number of consecutive bits set to one, starting from the least significant bit.
has_single_bit	Check if a value has only a single bit set to one. This is the same as testing whether a value is a power of two.
popcount	Count the number of bits set to one.
rotl	Compute the result of a bitwise left-rotation.
rotr	Compute the result of a bitwise right-rotation.

See also

Header Files Reference