http://d.puremagic.com/issues/show_bug.cgi?id=11111

           Summary: std.algorithm.canFind fails to find in range
           Product: D
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: alienballance@gmail.com


--- Comment #0 from Mariusz Gliwiński <alienballance@gmail.com> 2013-09-23 13:19:17 PDT ---
import std.algorithm : canFind;
import std.stdio : writeln;

void main()
{
    auto r1 = [1,3,4];
    auto r2 = [5,2,3,8,0];
    writeln(r1.canFind(r2)); // false
    writeln(r2.canFind(r1)); // false
}

// DMD 2.063.2

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Peter Alexander <peter.alexander.au@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |peter.alexander.au@gmail.co
                   |                            |m


--- Comment #1 from Peter Alexander <peter.alexander.au@gmail.com> 2013-09-23 13:52:29 PDT ---
What's the bug? Neither range contains the other, so canFind returns false.

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Mariusz Gliwiński <alienballance@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


--- Comment #2 from Mariusz Gliwiński <alienballance@gmail.com> 2013-09-23 14:43:30 PDT ---
I'm sorry for reporting false bug-report then.

size_t canFind(alias pred = "a == b", Range, Ranges...)(Range haystack, Ranges
needles);

It's "Ranges" and not "Range" as i've seen, and:

"if used directly in the condition of an if statement or loop, the result will be true if one of the needles is found and false if none are found"

just looked like "find the first index of needle from Range of needles".

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monarchdodra@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
                 CC|                            |monarchdodra@gmail.com
         Resolution|INVALID                     |
            Summary|std.algorithm.canFind fails |std.algorithm.canFind
                   |to find in range            |should support Needles...


--- Comment #3 from monarchdodra@gmail.com 2013-09-23 23:30:25 PDT ---
(In reply to comment #2)
> I'm sorry for reporting false bug-report then.
> 
> size_t canFind(alias pred = "a == b", Range, Ranges...)(Range haystack, Ranges
> needles);
> 
> It's "Ranges" and not "Range" as i've seen, and:
> 
> "if used directly in the condition of an if statement or loop, the result will be true if one of the needles is found and false if none are found"
> 
> just looked like "find the first index of needle from Range of needles".

I think it's worth noting that "Ranges..." is a gratuitious limitation, as the function would perfectly support "Needles". EG: If you unlock the restraint, than this work for me:

assert([1, 2, 3].canFind(5, [1, 2, 3], 2) == 3);

I renamed the bug report, it should be fixed.

--------

In your original use case though, I don't think we have any version of find that accepts a variable amount of needles (which is what you were asking for?).

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