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Mon Oct 20 10:15:40 EDT 2003 · http://mail.python.org/pipermail/python-dev/2003-October/039059.html

MSVC complains when a signed int is compared to an unsigned int.  I'm glad
it does, because the compiler silently casts the signed int to unsigned,
which doesn't do what the author probably intended if the signed int is less
than 0:

#include <stdio.h>

void main()
{
	int i = -1;
	unsigned int j = 0;
	printf("%d\n", i < j);
}

That prints 0, i.e. it is not the case that -1 < 0U.

_sre.c(852) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1021) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1035) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1109) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1131) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1192) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1230) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1267) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1285) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1287) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1294) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1314) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1344) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1362) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1384) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1476) : warning C4018: '<' : signed/unsigned mismatch
_sre.c(1492) : warning C4018: '<' : signed/unsigned mismatch

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Showing content from http://mail.python.org/pipermail/python-dev/2003-October/039059.html below:

[Python-Dev] New warnings in _sre.c