[erlang-questions] term_to_binary and message passing
Thu Dec 28 15:33:41 CET 2006
On 28 dec 2006, at 14.52, Joel Reymont wrote:
> junior:~ joelr$ erl
> Erlang (BEAM) emulator version 5.5 [source] [async-threads:0] [hipe]
> Eshell V5.5 (abort with ^G)
> 1> size(term_to_binary(0.2)).
> Does this mean that any float I send within the VM will result in a
> 33-byte message?
If you look in sys_float.c (under erts/emulator/sys/unix ) you will
find the function sys_double_to_chars.
Why this encoding is used instead of IEEE float encoding is a
"historical" issue, that been argued about now
and then ;-) My opinion is that it's an over kill, but who use
floating point any way :-)
sprintf(buf, "%.20e", fp);
The code even covers locale differences translating , into . ..
I wish you all a happy new year !
> Thanks, Joel
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