dconv::schubfach Namespace Reference

Functions
constexpr int	floorLog10Pow2 (int q, bool asymmetric) noexcept
	compute floor (log10 (2^q)) or floor (log10 (3/4 * 2^q)).
constexpr int	floorLog2Pow10 (int k) noexcept
	compute floor (log2 (10^k)).
uint64_t	roundToOdd (const details::Power &g, uint64_t cp) noexcept
	multiply by a power of ten and round to odd.
uint64_t	shortest (double value, int &k) noexcept
	compute the shortest decimal significand.
void	generate (char *buffer, int &length, int &k, double value) noexcept
	write the shortest decimal digits.
char *	dtoa (char *buffer, double value) noexcept
	double to string conversion using Schubfach.

Function Documentation

dtoa()

char * dconv::schubfach::dtoa ( char * buffer, double value )

inlinenoexcept

double to string conversion using Schubfach.

Parameters

buffer	buffer to write the string representation to (must point to at least 25 writable bytes).
value	value to convert.

Returns

end position.

floorLog10Pow2()

int dconv::schubfach::floorLog10Pow2 ( int q, bool asymmetric )

constexprnoexcept

compute floor (log10 (2^q)) or floor (log10 (3/4 * 2^q)).

Parameters

q	binary exponent.
asymmetric	compute floor (log10 (3/4 * 2^q)) if true.

Returns

decimal exponent.

floorLog2Pow10()

int dconv::schubfach::floorLog2Pow10 ( int k )

constexprnoexcept

compute floor (log2 (10^k)).

Parameters

k	decimal exponent.

Returns

binary exponent.

generate()

void dconv::schubfach::generate ( char * buffer, int & length, int & k, double value )

inlinenoexcept

write the shortest decimal digits.

Parameters

buffer	buffer to write the digits to.
length	number of digits written.
k	decimal exponent.
value	positive value to convert.

roundToOdd()

uint64_t dconv::schubfach::roundToOdd ( const details::Power & g, uint64_t cp )

inlinenoexcept

multiply by a power of ten and round to odd.

Parameters

g	power of ten.
cp	value to multiply.

Returns

product rounded to odd.

shortest()

uint64_t dconv::schubfach::shortest ( double value, int & k )

inlinenoexcept

compute the shortest decimal significand.

Parameters

value	positive value to convert.
k	decimal exponent.

Returns

decimal significand, possibly with trailing zeros.