There are a number of use cases in the standard library, and I have run into my own code, situations where I want to pass an input and an output range that must be the same size, often to some algorithm. At present this requires three, or four if you want to be careful, iterators. Often there is then a bunch of checking to make sure the iterators make sense.
I am aware that array_view might, in some cases, coalesce pairs of being/end iterators but that still leaves checks required that the input and output array_views might be different size. Has there been any discussion on a class to contain both the input and the output range specifications? Maybe the range proposal solves some or all of this of this but I'm not clear how it does.
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