On Friday, 22 August 2014 at 10:44:31 UTC, Marc Schütz wrote:
On Friday, 22 August 2014 at 08:44:51 UTC, Suliman wrote:
foreach (field; result.tupleof)
Why I should here specify type of iterable element, but not
first element that I use for iteration?
I mean:
foreach (_some_type_possible_enum_ field; result)
?
You mustn't, because your struct could have fields of different
types. When you `foreach()` over a tuple, the compiler unrolls
the loop body, which allows it to use a (potentially) different
type on each iteration.
If you don't want this, and all the fields have the same type,
you can iterate over an array made from the fields:
foreach (field; [result.tupleof]) {
writeln(field);
}
Or you could implement opApply or range primitives in the struct.
http://ddili.org/ders/d.en/foreach_opapply.html
http://dlang.org/phobos/std_range.html
