subclassing

[Jesse Phillips]

Jonathan M Davis Wrote:


> I should point out that you forgot the save property, which is required for 
> forward ranges (though not input ranges). Without it, any algorithm which 
> processes the range will consume it.

Trying to ease this guy into ranges.

I did notice though, the InputRange interface requires quite a few more methods than is required for an InputRange. Specifically, moveFront and opApply. So I guess my question ends up being, why (not to you specifically...)?