On 1/28/14 4:14 PM, bearophile wrote:
This is not an enhancement request, but it presents a potential
enhancement.
This is C++11 code:
template<int... digits> struct value;
template<> struct value<> {
static const int v = 0;
};
template<int first, int... rest> struct value<first, rest...> {
static int const v = 10 * value<rest...>::v + first;
};
You can translate it to D like this:
enum isInt(T) = is(T == int);
template value(xs...) if (allSatisfy!(isInt, xs)) {
static if (xs.length == 0)
enum value = 0;
else
enum value = xs[0] + 10 * value!(xs[1 .. $]);
}
int value(int xs[]...) {
int result = 0;
foreach (i; xs) {
result += 10 * result + i;
}
return result;
}
unittest
{
static assert(value(1, 2) == 21);
}
Andrei
