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Re: cpplib: Tweak conditional block skipping
On Thu, Jul 26, 2001 at 06:54:14AM +0100, Neil Booth wrote:
> Well, we'd wrap.
Yes, and what are the implications of that? Does the compiler fail?
If so, I'd say this is unacceptable.
> But 4 million is way over what the standard requires.
> We could always increase it to 22 bits and 10 for the column :-)
2**22 _is_ 4MB. And the standard requires at least 4k columns,
which is 12 bits, which leaves you with a measly 1MB for a line
number, which is probably exceeded by any nontrivial use of c++.
The only guaranteed unique position number I can see you using
is an off_t, which of course doesn't carry column number info,
but one could easily put together an nlgn or better lookup
mechanism to get a line number, with the column as the remainder.
If you insist on directly encoding line and column, I can't see
you doing anything acceptible in under 28+16=44 bits.