[Issue 9611] New: std.algorithm.nWayUnion(Tuple) too?

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http://d.puremagic.com/issues/show_bug.cgi?id=9611

           Summary: std.algorithm.nWayUnion(Tuple) too?
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2013-02-27 15:12:43 PST ---
In some cases I have had to merge ranges of different type. So maybe for such
situations it's worth supporting nWayUnion of a Tuple of ranges:


import std.algorithm: nWayUnion, map;
import std.range: iota;
import std.typecons: tuple;
void main() {
    auto a = iota(10);
    auto b = [3, 6, 9];
    auto c = iota(11).map!q{a * a};
    auto r = nWayUnion(tuple(a, b, c));
}


Note: in all such of my usage cases the number of the ranges was limited, 2 or
3. So when the input of nWayUnion is a tuple I think there is no need for
nWayUnion to keep the ranges inside with a BinaryHeap.

- - - - - - - - - - - - - -

Current workaround, suggested by Ali Çehreli:

import std.algorithm: nWayUnion, map;
import std.range: iota, InputRange, inputRangeObject;
void main() {
    InputRange!int a = inputRangeObject(iota(10));
    InputRange!int b = inputRangeObject([3, 6, 9]);
    InputRange!int c = inputRangeObject(iota(11).map!q{a * a});
    auto r = nWayUnion([a, b, c]);
}

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