On Friday, 4 August 2017 at 13:09:55 UTC, Steven Schveighoffer
wrote:
Any foreach range statement like this:
foreach(var; A .. B)
is treated as if you wrote:
for(auto var = A; var < B; ++var)
So it's pretty much exactly like what you wrote, just the
initializer is different but the result is the same.
> as incrementing is a costly operation?
Here is increment in bigint:
https://github.com/dlang/phobos/blob/master/std/bigint.d#L563
And addOrSubInt:
https://github.com/dlang/phobos/blob/master/std/internal/math/biguintcore.d#L508
I think there is room for improvement, as incrementing or
decrementing by 1 is probably something that can be optimized.
-Steve
Not quite,
foreach(x;A .. B)
it's lowerd to
auto limit = B;
auto key = A;
for(auto x = key;key < limit;++key)
{
// use x
}
