On Friday, 13 March 2015 at 12:49:48 UTC, Dennis Ritchie wrote:
On Friday, 13 March 2015 at 02:38:18 UTC, Rikki Cattermole
wrote:
You could assign it to e.g. an enum. Or force it over using
meta-programming.
And this code can be rewritten to D?
template <int n>
struct Factorial
{
enum { value = n * Factorial<n - 1>::value };
};
template <>
struct Factorial<0>
{
enum { value = 1 };
};
int main()
{
constexpr auto x = Factorial<5>::value;
constexpr auto y = Factorial<7>::value;
}
confusingly, D uses enum for named compile-time constants.
http://ddili.org/ders/d.en/enum.html
If you take Rikki's example and apply it to an enum(i.e,
enum x = factorial(5);
)
the program will fail to compile if it can't be computed at
compile-time.
