Re: int64 to decimal string conversion

[Andre Leiradella <andre@...>]

 Lua numbers are doubles by default. Doubles only have 52 bits for the 
significant.

If you want to avoid external dependencies, you can write your own 
bignum library in lua to deal with numbers 52+52=104 bits wide. Values 
would be (a * 2^52 + b) where a is the top 52 bits and b the bottom 
ones, so it's just a question of math to derive the arithmetic operations ;)

On 07/10/2010 20:55, Cosmin Apreutesei wrote:
> Hi,
>
> This post may sound stupid, but I haven't found/been able to produce a
> decent int64 (read as 2 ints or 8 bytes or whatever) to string
> conversion function made in Lua without bitops or integer
> multiplication past 52bit. Any hints/links? Just want to provide it as
> a fallback to installing a bignum library in fbclient.
>
> Thanks,
> Cosmin.