Hi,
When using gcc3 for mingw, I always get a "left shift count >= width of
type" error when including a specific boost header,
boost-1_39/boost/date_time/filetime_functions.hpp, at line 101, which
looks like:
const uint64_t c1 = 27111902UL;
const uint64_t c2 = 3577643008UL; // issues warning without 'UL'
const uint64_t shift = (c1 << 32) + c2;
where uint64_t is an unsigned long long.
interestingly, if I add the above code in a simple function, no warning
occurs. but, if I add the above code into a function template (as it is
in the boost include file), I do get the warning. so something like:
template< typename T >
void foo() {
/* shift is difference between 1970-Jan-01 & 1601-Jan-01
* in 100-nanosecond intervals */
const uint64_t c1 = 27111902UL;
const uint64_t c2 = 3577643008UL; // issues warning without 'UL'
const uint64_t shift = (c1 << 32) + c2;
}
will result in a warning, without the template, it does not.
what is the reason for this warning, and how can it be averted?
Akos
