On Thursday, 31 March 2016 at 13:39:25 UTC, ixid wrote:
What is going on with UFCS and foreach?
There's no such thing as UFCS on foreach. UFCS only works on
variables, not a foreach statement.
foreach(i;0..5).writeln;
You can add a line break and optional braces there to see what it
really is:
foreach(i;0..5) {
.writeln;
}
It is just an ordinary loop calling writeln 5 times. The leading
dot in D means "look up in the global namespace".
foreach(i;0..5).i.writeln;
foreach(i; 0 .. 5) {
.i.writeln;
}
It is trying to look up a name i in global scope, and calling
writeln on it.
This is why the .name syntax exists: so you can bypass local
variables with the same name when trying to access a global.
It would compile if you put an `int i;` at the top of your
module... try it!
foreach(i;0..5).writeln(i);
foreach(i; 0 .. 5) {
.writeln(i); // leading . just means call global writeln
}
What you're seeing is similar to the Java hoax where people say
it supports hyperlinking:
public static void main() {
http://dlang.org/awesome
}
That compiles, but it isn't a link, it just looks like one at
first.
It is actually a label, "http:", followed by a comment,
"//dlang.org....". Two legal things without whitespace that looks
like something else at first glance.
