Hi,
I'm glad that I've started what seems to be an interesting discussion.
Unfortunately, as I'm no developer, I must admit that I've no clue on how
to (if I even can) adapt the code with any of the suggestions discussed.
So, support on next steps would be more than welcome ;¬).
Cheers,
Alex
From: Philipp Janda <siffie...@gmx.net>
To: luarocks-developers@lists.sourceforge.net,
Date: 13/10/2014 20:47
Subject: Re: [Luarocks-developers] Problem installing
luasql-postgresql
Am 13.10.2014 um 17:10 schröbte Daurnimator:
> On 10 October 2014 18:43, Philipp Janda <siffie...@gmx.net> wrote:
>
>>
>> Not if you do it right from the beginning. Having programmed in C++
>> usually helps, because you have a clear idea of object ownership, and
>> Lua errors in combination with the Lua stack and the GC is a lot like
>> C++ exceptions with automatic destructors.
>
>
> In this circumstance; its perfectly valid to just use `alloca(3)`[1] and
> just allocate on the stack.
This is basically the same as the variable length array (it also causes
undefined behavior on stack overflow), but it isn't in any ISO C
standard (or POSIX). Also, the portable fallback for `alloca`[3] that is
included in many software projects allocates on the heap, not the stack.
> No need to worry about malloc or even lua_newuserdata (though I do that
> frequently too[2])
What do you have to worry about `lua_newuserdata`? It is a single
fire-and-forget function call much like `alloca` ...
Philipp
> [1] http://linux.die.net/man/3/alloca
> [2] e.g.
>
https://github.com/daurnimator/lua-systemd/blob/1a6fe1f60a/src/journal.c#L30
[3]:
https://opensource.apple.com/source/gcc/gcc-1640/libiberty/alloca.c
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