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C++
 
Utilities library
General utilities
Relational operators (deprecated in C++20)
Integer comparison functions
(C++20)(C++20)(C++20)    
(C++20)
Swap and type operations
(C++20)
(C++14)
(C++11)
(C++23)
(C++11)
(C++23)
(C++11)
(C++11)
(C++17)
Common vocabulary types
(C++11)
(C++17)
(C++17)
(C++17)
(C++11)
(C++11)
(C++17)
(C++17)
(C++23)



 
Bit manipulation
(C++20)
(C++23)
Integral powers of 2
(C++20)
(C++20)
(C++20)
(C++20)
Rotating
(C++20)
(C++20)
Counting
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
Permutation
(C++29)
(C++29)
(C++29)
(C++29)
Endian
(C++20)
 

Provides several function templates to access, manipulate, and process individual bits and bit sequences.

Defined in header <bit>
Defined in namespace std
(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]
Integral powers of 2
(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]
Rotating
(C++20)
 computes the result of bitwise left-rotation
(function template) [edit]
(C++20)
 computes the result of bitwise right-rotation
(function template) [edit]
Counting
(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]
Permutation
(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]
Endian
(C++20)
 indicates the endianness of scalar types
(enum) [edit]

Notes

Feature-test macro Value Std Feature
__cpp_lib_bit_cast 201806L (C++20) std::bit_cast
__cpp_lib_bitops 201907L (C++20) Bit operations
202606L (C++29) Bit permutation
__cpp_lib_int_pow2 202002L (C++20) Integral power-of-2 operations
__cpp_lib_byteswap 202110L (C++23) std::byteswap

See also

C documentation for Bit manipulation