On Saturday, 30 December 2017 at 19:00:07 UTC, aliak wrote:
On Friday, 29 December 2017 at 20:47:44 UTC, Dukc wrote:
[...]
Hmm, interesting. Not sure that's what I'm looking for but I
like it anyway :)
I'm more looking to deal with situations like this:
Instead of this:
auto result = range.op!f;
if (!result.empty) {
result.front.method();
}
This:
range.op!f.ifFront.method();
In the above scenario I only want method to be called if the
pipeline resulted in any element left in the range.
[...]
True you don't want to call front on empty, but sometimes I
only care to call a method on front if it's there. Where the
situation necessitates the existence of front, and not having a
front is indeed a bug, then you want the program to terminate,
yes. But not otherwise.
it would be actually great in such scenarios if d had a language
construct for existantial checks. you'd just be able to do
range.front?.method(). but no, it is not 2017. d does not need it.
