Heh, incidentally I was looking over the same issue recently.
I think we need for a much more radical approach. We need to be able to
parse any stream of characters (that means lookahead == 1) and stop as
soon as the meaningful input has ended.
Walter wrote a while back some solid floating point parsing routines for
dmc. I think we should start with those and adapt them to work with
input streams instead of strings.
This applies to std.format too, which is in dire need of an overhaul to
make it work with all streams.
Andrei
David Simcha wrote:
I looked into creating D implementations of equivalent functions to
strtold, etc. to address bug 3758
(http://d.puremagic.com/issues/show_bug.cgi?id=3758). It seems like
converting strings to floats is actually pretty hard to do right, i.e.
without any loss of precision. However, the inefficiency of requiring
several heap allocations per conversions hurts when reading in large
files. From some measurements I did, it seems like the heap allocation
and associated garbage collection is the bigger source of overhead than
the string copying. Is everyone ok with me optimizing std.conv.parse to
place the zero-terminated version of the string on the stack if it's
reasonably small as a temporary fix?
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