Using the cstdint
header portably can be quite a challenge (it is missing from some MSVC implementations). At the same time numeric_limits::max()
can be hard to use without constexpr
and it is not actually required to work with uint64_t
. If you don't care about those things too much, std::numeric_limits<uint64_t>::max()
will most likely do the trick.
Boost.Integer has an implementation of cstdint
and comes with an extra traits class to get a constant maximal value. A compliant implementation of cstdint
should also provide the macro UINT64_MAX
, but I'm not sure about boost.