Lars T. Kyllingstad wrote:
Michael Rynn wrote:
On the D2 online pages
(http://www.digitalmars.com/d/2.0/statement.html#ForeachStatement)there
is
Foreach over Structs and Classes with Ranges
My question is , is there a working example of foreach ( e ; range )?
Iteration over struct and class objects can be done with ranges, which
means the following properties must be defined:
Property Purpose
.empty returns true if no more elements
.next move the left edge of the range right one
.retreat move the right edge of the range left one
.head return the leftmost element of the range
.toe return the rightmost element of the range
So I tried this , but foreach did not work, but using the equivalent
for loop code did.
Looks like you ran into a piece of hopelessly outdated documentation.
The correct names are, in the same order:
empty
popFront
popBack
front
back
Those should work with foreach.
Actually, when I think about it, I think foreach just needs empty,
front, and popFront to work. back and popBack are needed for traversing
a range in reverse:
foreach (elem; retro(range)) { ... }
-Lars
-Lars
