http://d.puremagic.com/issues/show_bug.cgi?id=6852

           Summary: Cannot compare instances of ParameterStorageClassTuple
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: andrej.mitrovich@gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2011-10-25 09:43:42 PDT ---
import std.traits;

void test(T1, T2)(T1 t1, T2 t2)
{
    alias ParameterTypeTuple Types;
    static assert(is(Types!T1 == Types!T2));  // ok

    alias ParameterStorageClassTuple Stores;
    static assert(Stores!(t1) == Stores!(t2)); // NG
    static assert(Stores!T1 == Stores!T2);     // NG
    static assert(is(Stores!t1 == Stores!t2)); // NG
    static assert(is(Stores!T1 == Stores!T2)); // NG
}

void main()
{
    test( (int){},
          (int){});
}

What gives? ParameterTypeTuple doesn't suffer from these issues. It seems it's impossible to compare equality of storage classes between two functions. :s

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--- Comment #1 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2011-10-25 09:47:55 PDT ---
Funky workaround:

alias Stores!T1 x;
alias Stores!T2 y;
static assert(x.stringof == y.stringof);

Boo!

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Kenji Hara <k.hara.pg@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
           Platform|Other                       |All
         Resolution|                            |FIXED
         OS/Version|Windows                     |All


--- Comment #2 from Kenji Hara <k.hara.pg@gmail.com> 2013-04-04 22:13:37 PDT ---
(In reply to comment #0)
> What gives? ParameterTypeTuple doesn't suffer from these issues. It seems it's impossible to compare equality of storage classes between two functions. :s

ParameterStorageClassTuple makes a tuple of values, so

>     alias ParameterStorageClassTuple Stores;
>
>     static assert(Stores!(t1) == Stores!(t2)); // NG
>     static assert(Stores!T1 == Stores!T2);     // NG

value comparison would work, but

>     static assert(is(Stores!t1 == Stores!t2)); // NG
>     static assert(is(Stores!T1 == Stores!T2)); // NG

type comparison would not work.

From 2.063, value tuple comparison would work by fixing issue 9873.

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