On Monday, 21 July 2014 at 01:42:58 UTC, Daniel Gibson wrote:
Am 21.07.2014 03:34, schrieb Vlad Levenfeld:
To get a foreach to run at compile-time, you have to give it
something
whose value is known to the compiler (so, T and
typeof(argTuple) would
suffice, and 0..T.length really should as well).
Yup
I use this when i want a compile time foreach(from a constant
number). It's slightly longer but has worked great for me thus
far.
template staticIota(size_t s, size_t e, size_t step = 1)
{
import std.typetuple : TypeTuple;
static if(s < e)
alias staticIota = TypeTuple!(s, staticIota!(s + step, e));
else
alias staticIota = TypeTuple!();
}
usage:
unittest
{
foreach(i; staticIota!(0, 10))
{
pragma(msg, i);
}
}
//Outputs 1 to 10 at compile-time.
