bit File Reference

The <bit> header from C++20's standard library. More...

#include <climits>
#include <type_traits>
#include <cstddef>

Include dependency graph for bit:

This graph shows which files directly or indirectly include this file:

Namespaces
namespace	std
	SeqAn specific customisations in the standard namespace.

Macros
#define	SEQAN3_CPP_LIB_BITOPS   IMPLEMENTATION_DEFINED
	A workaround for __cpp_lib_bitops for gcc version 9.x (in C++20 mode). Those versions implemented std::countl_zero, etc, but did not define that feature detection macro.
#define	SEQAN3_CPP_LIB_ENDIAN   IMPLEMENTATION_DEFINED
	A workaround for __cpp_lib_endian for gcc version 8.x (in C++20 mode). Those versions implemented std::endian, but did not define that feature detection macro.
#define	SEQAN3_CPP_LIB_INT_POW2   IMPLEMENTATION_DEFINED
	This defines __cpp_lib_int_pow2.Note: g++-9.3 -std=c++2a on ubuntu 20.04 did #define __cpp_lib_int_pow2 201806L, which is an older implementation of the __cpp_lib_int_pow2 proposal. More...

Enumerations
enum class	std::endian { std::endian::little = __ORDER_LITTLE_ENDIAN__ , std::endian::big = __ORDER_BIG_ENDIAN__ , std::endian::native = __BYTE_ORDER__ }
	Indicates the endianness of all scalar types. More...

Functions
template<class T >
constexpr T	std::bit_ceil (T x) noexcept
	Calculates the smallest integral power of two that is not smaller than x. More...
template<class T >
constexpr T	std::bit_width (T x) noexcept
	If x is not zero, calculates the number of bits needed to store the value x, that is, 1 + floor(log2(x)). If x is zero, returns zero. More...
template<class T >
constexpr int	std::countl_zero (T x) noexcept
	Returns the number of consecutive 0 bits in the value of x, starting from the most significant bit ("left"). More...
template<class T >
constexpr int	std::countr_zero (T x) noexcept
	Returns the number of consecutive 0 bits in the value of x, starting from the least significant bit ("right"). More...
template<class T >
constexpr bool	std::has_single_bit (T x) noexcept
	Checks if x is an integral power of two. More...
template<class T >
constexpr int	std::popcount (T x) noexcept
	Returns the number of 1 bits in the value of x. More...

Detailed Descriptionno-api

The <bit> header from C++20's standard library.

Author

Enrico Seiler <enrico.seiler AT fu-berlin.de>

Marcel Ehrhardt <marcel.ehrhardt AT fu-berlin.de>