October 17, 2012
> 1. Define opApply (see section labeled "Foreach over Structs and Classes with
> opApply after here: http://dlang.org/statement.html#foreach_with_ranges)
> 2. Or make it a range (see http://dlang.org/statement.html#foreach_with_ranges
> and http://ddili.org/ders/d.en/ranges.html ), which would probably be a bad
> idea, since containers really shouldn't be ranges.
> 3. Or do what std.container does and overload opSlice which returns a range
> over the container (see http://dlang.org/operatoroverloading.html#Slice and
> http://dlang.org/phobos/std_container.html in addition to the links in #2).
> Overall, this is the best approach.
> But regardless of which approach you take, you really should read up on ranges
> if you want to be doing much with D's standard library, and
> http://ddili.org/ders/d.en/ranges.html is the best tutorial on them at this
> point. There's also this recent article by Walter Bright which explains one of
> the main rationales behind ranges:
> http://www.drdobbs.com/architecture-and-design/component-programming-in-
> d/240008321
> - Jonathan M Davis

Awesome thanks Jonathan! I've read that guide on ranges before and they sound very interesting. I'm currently playing with recursive collections and opApply works great.
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