This module defines the notion of a range. Ranges generalize the concept of arrays, lists, or anything that involves sequential access. This abstraction enables the same set of algorithms (see std.algorithm) to be used with a vast variety of different concrete types. For example, a linear search algorithm such as std.algorithm.searching.find works not just for arrays, but for linked-lists, input files, incoming network data, etc.
This module is a submodule of std.range.
foreach iteration uses opApply, since one delegate call per loop iteration is faster than three virtual function calls.