November 10, 2007
http://d.puremagic.com/issues/show_bug.cgi?id=1659

           Summary: template alias parameters are chosen over all but exact
                    matches.
           Product: D
           Version: 2.007
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla@digitalmars.com
        ReportedBy: spunit262@yahoo.com


For example say I have a class foo and a class diverged from foo called bar, and I have a template specialization for foo and a template by the same name that takes an alias. I instantiate that template with bar and get the alias version. The spec say that the most specialized version is chosen, but isn't an alias template the least specialized type of template, even more so than a unspecialized template that takes a generic type?


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November 10, 2007
http://d.puremagic.com/issues/show_bug.cgi?id=1659





------- Comment #1 from spunit262@yahoo.com  2007-11-10 13:28 -------
Created an attachment (id=208)
 --> (http://d.puremagic.com/issues/attachment.cgi?id=208&action=view)
an example


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April 03, 2009
http://d.puremagic.com/issues/show_bug.cgi?id=1659





------- Comment #2 from gide@nwawudu.com  2009-04-03 16:04 -------
Including original attachment in this comments. Issue looks similar to BUG 918.

import std.stdio;

typedef char ctd;
class Foo { }
class Bar : Foo { }

void main()
{
    Baz!(char)(); /* regular template version used only because
                   * template alias parameters reject basic types. */
    Baz!(ctd)(); // alias version used
    Baz!(Foo)(); // Foo version used
    Baz!(Bar)(); // alias version used
}

void Baz(T)()
{
    writefln("regular template version called with ", T.stringof);
}

void Baz(T : Foo)()
{
    writefln("foo specialization called with ", T.stringof);
}

void Baz(alias T)()
{
    writefln("alias version called with ", T.stringof);
}


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January 25, 2010
http://d.puremagic.com/issues/show_bug.cgi?id=1659


Witold Baryluk <baryluk@smp.if.uj.edu.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |baryluk@smp.if.uj.edu.pl


--- Comment #3 from Witold Baryluk <baryluk@smp.if.uj.edu.pl> 2010-01-24 21:09:54 PST ---
This problem is still present in DMD 2.039.
It looks that from unknown reasons bug918 is solved (nobody comented what was
source of regression and dissapiring of it). Probably it is different aspect
here of template matching.

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