• d-bugmail puremagic.com (42/42) Jul 03 2012 http://d.puremagic.com/issues/show_bug.cgi?id=8341

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8341

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



This sorts (in reverse) the arrays a and b according to the (a,b) pairs:

import std.stdio, std.algorithm, std.range;
void main() {
    auto a = [10, 20, 30];
    auto b = ["c", "b", "a"];
    writeln(a, " ", b);
    sort!q{a > b}(zip(a, b)); // OK
    writeln(a, " ", b);
}


Output:

[10, 20, 30] ["c", "b", "a"]
[30, 20, 10] ["a", "b", "c"]



But this code doesn't compile:

import std.stdio, std.algorithm, std.range;
void main() {
    auto a = [10, 20, 30];
    auto b = ["c", "b", "a"];
    writeln(a, " ", b);
    topN!q{a > b}(zip(a, b), 4); // error
    writeln(a, " ", b);
}


With the latest DMD2.060alpha it gives several errors like:

algorithm.d(6826): Error: template std.algorithm.swap does not match any
function template declaration

I think topN doesn't need to ask more features than sort() to the range you
give it. So maybe topN too should work here.

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