Math: export_int, export_real, export_real32, import_int, import_real, import_real32 - conversion to and from external representation .EX include "math.m"; math := load Math Math->PATH; export_int: fn(b: array of byte, x: array of int); export_real32: fn(b: array of byte, x: array of real); export_real: fn(b: array of byte, x: array of real); import_int: fn(b: array of byte, x: array of int); import_real32: fn(b: array of byte, x: array of real); import_real: fn(b: array of byte, x: array of real); These routines convert between Limbo's internal representation of integer and floating-point values, and equivalent external representations as arrays of bytes, allowing efficient input/output of binary representations.

Export_int( b , x ) converts each integer element of array x into a sequence of 4 bytes in array b .

Export_real( b , x ) converts each double-precision floating-point element of array x into a sequence of 8 bytes in array b .

Export_real32( b , x ) converts each double-precision floating-point element of array x to a single-precision value, then encodes it as a sequence of 4 bytes in array b .

Each import_ T operation reverses the transformation of the corresponding export_ T operation, converting an array of bytes containing a sequence of external representations into an array of values of the appropriate internal form.

Values are encoded in big-endian order (most significant byte first), with floating-point values represented in IEEE 32-bit or 64-bit form (again, most significant byte first).

/libinterp/math.c math-intro (2)