Re: How to determine if double contains an integer value?
DeCaf wrote:
To complete this discussion, it would also be interesting to find out
a good way to figure out not only if the double (or other floating
point type) contains an integer, for which I think we've found a few
working ways, but also to find out if that value will fit in a
specific integer type.
Would the following test suffice for that?
Seems OK to me, but I'd make it a template.
bool is_int(double d)
template<class T>
bool fits_into(double d)
{
return std::fmod(d, 1.0) == 0.0 &&
f >= (double)std::numeric_limits<int>::min() &&
... numeric_limits<T>::min() &&
f <= (double)std::numeric_limits<int>::max();
... numeric_limits<T>::max();
}
If we for the moment disregard any rounding errors. Obviously the
above would fail if double can not contain the max/min of the integer
type, but that doesn't really seem feasible, does it?
V
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