On 2013-06-23 13:26, Lemonfiend wrote:
foreach (I i; array) {
if (B b = cast(B) i) { ... }
}
Thanks all 3 of you for the quick and identical answers. :)
It had not occurred to me to use a cast for this, but indeed the
language ref says the same:
"In order to determine if an object o is an instance of a class B use a
cast"
It does a bit inelegant to me.. Or are casts simply extremely cheap?
You can do something like this as well:
if (i.classinfo is B.classinfo) { }
But doing the cast is more efficient if you want to use the object of as
the type you're checking for.
You can also hide the cast in a function if you want to be a bit more
clear of the intent:
T instanceOf (T) (Object value)
{
return cast(T) value);
}
if (i.instanceOf!(B)) { }
--
/Jacob Carlborg
