Re: lua_Integer in Lua 5.3

[Lourival Vieira Neto <lourival.neto@...>]

On Mon, Dec 2, 2013 at 6:22 PM, Philipp Janda <siffiejoe@gmx.net> wrote:
> Am 02.12.2013 20:55 schröbte Lourival Vieira Neto:
>
>>>> Simple answer: int64_t is C99, Lua tries to stay compatible with C89.
>>>
>>>
>>>
>>> ... and although "long long" is not in C90 either, it was implemented as
>>> an
>>> extension by many C90 compilers (and C++, I believe) before the C99
>>> standard
>>> was defined. Also, "long long" is not required to be 64 bits wide (but it
>>> is
>>> at least as wide as a "long"). "ptrdiff_t" on the other hand *is* in C90
>>> and
>>> has a good chance to be 64 bits on a machine that supports 64 bit
>>> addresses.
>>
>>
>> Just making it clearer.. Lua 5.3 uses long long instead of ptrdiff_t
>> for lua_Integer, by default.
>
>
> Makes sense. "long long" has a much higher chance of being 64 bits on 32 bit
> machines, and having 64 bit integers becomes important in Lua 5.3.

In fact, my question was: why don't use int64_t instead? Once it
always has 64 bit width.

Regards,
-- 
Lourival Vieira Neto