huaiyu wei
this is a sample for mbed(LPC1768)
serialization_lib/double_conversion.h
- Committer:
- 1
- Date:
- 2015-11-19
- Revision:
- 0:3163adfd2cf1
File content as of revision 0:3163adfd2cf1:
/* AVR-GCC does not have real double datatype. Instead its double
* is equal to float, i.e. 32 bit value. If you need to communicate
* with other systems that use double in their .proto files, you
* need to do some conversion.
*
* These functions use bitwise operations to mangle floats into doubles
* and then store them in uint64_t datatype.
*/
#ifndef DOUBLE_CONVERSION
#define DOUBLE_CONVERSION
#include <stdint.h>
/* Convert native 4-byte float into a 8-byte double. */
extern uint64_t float_to_double(float value);
/* Convert 8-byte double into native 4-byte float.
* Values are rounded to nearest, 0.5 away from zero.
* Overflowing values are converted to Inf or -Inf.
*/
extern float double_to_float(uint64_t value);
#endif