Value-to-Key functions

Value-to-Key functions to avoid using custom comparators. More...

Functions
LIBMDBX_API uint64_t	mdbx_key_from_jsonInteger (const int64_t json_integer)
LIBMDBX_API uint64_t	mdbx_key_from_double (const double ieee754_64bit)
LIBMDBX_API uint64_t	mdbx_key_from_ptrdouble (const double *const ieee754_64bit)
LIBMDBX_API uint32_t	mdbx_key_from_float (const float ieee754_32bit)
LIBMDBX_API uint32_t	mdbx_key_from_ptrfloat (const float *const ieee754_32bit)
uint64_t	mdbx_key_from_int64 (const int64_t i64)
uint32_t	mdbx_key_from_int32 (const int32_t i32)

Detailed Description

Value-to-Key functions to avoid using custom comparators.

See also

Key-to-Value functions

The mdbx_key_from_jsonInteger() build a keys which are comparable with keys created by mdbx_key_from_double(). So this allows mixing int64_t and IEEE754 double values in one index for JSON-numbers with restriction for integer numbers range corresponding to RFC-7159, i.e. \([-2^{53}+1, 2^{53}-1]\). See bottom of page 6 at https://tools.ietf.org/html/rfc7159

Function Documentation

mdbx_key_from_double()

LIBMDBX_API uint64_t mdbx_key_from_double

(

const double

ieee754_64bit

)

mdbx_key_from_float()

LIBMDBX_API uint32_t mdbx_key_from_float

(

const float

ieee754_32bit

)

mdbx_key_from_int32()

uint32_t mdbx_key_from_int32 ( const int32_t i32 )

inline

mdbx_key_from_int64()

uint64_t mdbx_key_from_int64 ( const int64_t i64 )

inline

mdbx_key_from_jsonInteger()

LIBMDBX_API uint64_t mdbx_key_from_jsonInteger

(

const int64_t

json_integer

)

mdbx_key_from_ptrdouble()

LIBMDBX_API uint64_t mdbx_key_from_ptrdouble

(

const double *const

ieee754_64bit

)

mdbx_key_from_ptrfloat()

LIBMDBX_API uint32_t mdbx_key_from_ptrfloat

(

const float *const

ieee754_32bit

)