[Boost-users] [mpl] instantiating long_<MAX_LONG> generates warning on VC7.1/.NET

28 Mar 2005

      On Visual Studio.NET / VC7.1 the following code:

#include <boost/mpl/long.hpp>
#include <climits>
boost::mpl::long_<LONG_MAX> lll;

Gives the following warning:
...\boost_1_32_0\boost\mpl\aux_\integral_wrapper.hpp(72) : warning C4307:
'+' : integral constant overflow
...\main.cpp(39) : see reference to class template instantiation
'boost::mpl::long_<N>' being compiled
with
[
N=2147483647
]

Obviously, the compiler is right about the overflow, and, IMHO, the same
holds for using any maximal/minimal value for a specific type.

Is this a known issue?
Does it cause any actual problems? (in other words: can I ignore the
warning? always? sometimes? never?)

Thanks,
Yariv Tal.