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- Subject: Some small requests for the next release
- From: nt <niklas@...>
- Date: Thu, 24 Feb 2005 12:18:52 -0400
A request for a few small additions to the next release. Forgive me if
the features are already available--I am using an older 5.0.
1) Add 'math.nan' as a constant to the math library. At the moment, the
"feature" of doing
local nan = tonumber("nan")
works, but is inconvenient, probably non portable and hard to
remember. Inclusion of the
if v ~= v then ---is nan
mechanism in the reference manual would also be nice in lieu of a
Obviously issues arise when numbers are not reals---I suppose
something such as MAXINT could
be returned for the integer case.
2) Perhaps I am missing something, but there does not appear to be a
convenient way to determine if a
table is empty. Perhaps a 'table.isEmpty(t)' function could be
added or even
local arraysize,haveHashes = table.stats(t)
which would reveal something about the internals of the table (i.e.
how much is allocated to array
and whether it is a pure array). Handy for estimating likely heap
size in test situations.
3) Some way to access file handles in C code. At the moment I have to
look at the io library source
and see that the file handle userdata is a "FILE*" and put in check
and caste code accordingly.
Probably not portable in general. Something like
'luaL_tofilehandle(L, arg)' might be helpful.
4) The issue of accessing nested tables comes up on a regular basis.
Doing so in the API is tedious, so
I am sure everyone has rolled their own equivalent of:
lua_gettablepath(L, arg, "key1", "key2", ..., NULL)
using varargs. Would be nice to standardize this as a convenience
5) Please, please add a section to the Reference Manual documenting the
functions in lauxilib.h. Would
make it much easier to get up to speed on what routines are
available. While I am on the subject,
it would also be nice if this was called 'luaaux.h' or something
with 'lua' at the front as that would
lessen the likelihood of collisions with other e.g. Linux include
files in future OS releases. Even
better would be something like:
but that is rather Unix specific and makes it a little harder to
have competing versions installed.