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The main std.range module provides template-based tools for working with
ranges, but sometimes an object-based interface for ranges is needed, such as
when runtime polymorphism is required. For this purpose, this submodule
provides a number of object and interface definitions that can be used to
wrap around range objects created by the std.range templates.
These interfaces are intended to provide virtual function-based wrappers
around input ranges with element type E. This is useful where a well-defined
binary interface is required, such as when a DLL function or virtual function
needs to accept a generic range as a parameter. Note that
and friends check for conformance to structural interfaces
not for implementation of these interface types.