Re: Lua 5.1 (beta) now available
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- Subject: Re: Lua 5.1 (beta) now available
- From: Rici Lake <lua@...>
- Date: 2005年11月18日 11:13:14 -0500
On 18-Nov-05, at 10:05 AM, Mike Pall wrote:
- Even after a few days of discovering it, I'm not sure what
table.maxn() is good for. IMHO it's superfluous and may
confuse newbies.
I agree (see <http://lua-users.org/lists/lua-l/2005-11/msg00133.html>)
- I suggest to make the NaN tests explicit and overridable:
#define luai_numisnan(a) ((a)!=(a))
[In case anyone wonders: isnan() is only defined in C99.]
I'm not convinced by this. (I agree with making the test explicit, just
not with the avoidance of isnan()). isnan() is in POSIX (since Issue 3,
it says here); furthermore, it has quite a long history of being
implemented, including in all the IEEE-754 emulation libraries I've
used. (It may require #include <ieee.h>, or some other non-standard
header.) On the other hand, I've certainly seen C compilers (though I
admit not for a long time) which would cheerfully optimize away the
(a)!=(a) check (which certainly should be optimized away if a is an
integer type.)