Bit manipulation (since C++20) - cppreference.com
From cppreference.com
Provides several function templates to access, manipulate, and process individual bits and bit sequences.
Defined in header | |
Defined in namespace | |
(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] |
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 |
__cpp_lib_int_pow2 |
202002L |
(C++20) | Integral power-of-2 operations |
__cpp_lib_byteswap |
202110L |
(C++23) | std::byteswap |