Ok, I've attached new versions of list.c and pg_list.h -- this is just a *rough sketch* of the new List code -- it definitely won't compile, the intent is just to concretely specify the new List design. Also, I've only updated the important list functions: I stopped at nth().
(I've attached the whole files, rather than diffs, because I thought that would be easier to read...)
Any comments would be welcome -- I'm sure I've mucked a few things up. Also, since it doesn't compile and I haven't done any testing, there are probably some thinkos & typos in the code.
On Tue, 2003-11-04 at 11:40, Tom Lane wrote:
Hmm ... taking that one step further, you could probably avoid the need for two palloc's in the first lcons/lappend if the List header were combined with the first ListCell. This would make for some grottiness in ldelete when removing the first list entry, but that's probably a good tradeoff.
I haven't implemented this (yet), or the aset.c changes you suggested.
Why instead of reinvent the whell not use, or at least do a "C" port of stl::list ? At my knowledge is the best/optimized list implementation.
And another my wish is too see Postgres compilable with a c++ compiler
so a day we can use ( in a absolutely portable way): vector, list, map already implemented, considering also the fact that all stl container
are "memory allocator" customizable, for example you can use a map using
an allocator in shared memory.
Regards Gaeatano Mendola
PS: My 2 cents: I don't like too much have the lenght inside the list struct.
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