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Interface std.range.interfaces.InputRange

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 Note that isInputRange and friends check for conformance to structural interfaces not for implementation of these interface types.

interface InputRange(E) ;


empty[get] bool
front[get] E


moveFront ()
opApply () foreach iteration uses opApply, since one delegate call per loop iteration is faster than three virtual function calls.
popFront ()


These interfaces are not capable of forwarding ref access to elements.

Infiniteness of the wrapped range is not propagated.

Length is not propagated in the case of non-random access ranges.

See Also



import std.algorithm.iteration : map;
import std.range : iota;

void useRange(InputRange!int range) {
    // Function body.

// Create a range type.
auto squares = map!"a * a"(iota(10));

// Wrap it in an interface.
auto squaresWrapped = inputRangeObject(squares);

// Use it.


Andrei Alexandrescu, David Simcha, and Jonathan M Davis. Credit for some of the ideas in building this module goes to Leonardo Maffi.


Boost License 1.0.