my_bit.h File Reference

Some useful bit functions. More...

#include <sys/types.h>
#include "my_config.h"
#include "my_inttypes.h"
#include "my_macros.h"

Go to the source code of this file.

Functions
static uint	my_bit_log2 (ulong value)
static uint	my_count_bits (ulonglong v)
static uint	my_count_bits_uint32 (uint32 v)
static uint32	my_round_up_to_next_power (uint32 v)
static uint32	my_clear_highest_bit (uint32 v)
static uint32	my_reverse_bits (uint32 key)
template<typename IntType >
constexpr bool	is_single_bit (IntType bits)
	Determine if a single bit is set among some bits. More...

Variables
const char	_my_bits_nbits [256]
const uchar	_my_bits_reverse_table [256]

Detailed Description

Some useful bit functions.

Function Documentation

is_single_bit()

template<typename IntType >

constexpr bool is_single_bit ( IntType  bits )

constexpr

Determine if a single bit is set among some bits.

Template Parameters

IntType

an integer type

Parameters

bits	the bits to examine

Return values

true	if bits equals to a power of 2
false	otherwise

my_bit_log2()

static uint my_bit_log2 ( ulong  value )

inlinestatic

my_clear_highest_bit()

static uint32 my_clear_highest_bit ( uint32  v )

inlinestatic

my_count_bits()

static uint my_count_bits ( ulonglong  v )

inlinestatic

my_count_bits_uint32()

static uint my_count_bits_uint32 ( uint32  v )

inlinestatic

my_reverse_bits()

static uint32 my_reverse_bits ( uint32  key )

inlinestatic

my_round_up_to_next_power()

static uint32 my_round_up_to_next_power ( uint32  v )

inlinestatic

Variable Documentation

_my_bits_nbits

const char _my_bits_nbits[256]

extern

_my_bits_reverse_table

const uchar _my_bits_reverse_table[256]

extern