http://d.puremagic.com/issues/show_bug.cgi?id=620

           Summary: Can't use property syntax with a template function
           Product: D
           Version: 0.175
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla@digitalmars.com
        ReportedBy: wbaxter@gmail.com


I'd like to call this a bug, but I can't find any place in the spec that states this should work.  However it seems logical that it would work given that the property magic is just syntactic sugar that treats foo=x as a regular function call foo(x).

---------------
int g_value;

void valuef(int v) {  g_value = v; }

void valuet(T)(T v) { g_value = v; }

void main()
{
    valuef = 42; // ok
    valuet = 42; // Error: valuet is not an lvalue
                 // Error: cannot implicitly convert expression (42) of type
int to void
}


-- 

http://d.puremagic.com/issues/show_bug.cgi?id=620


Simen Kjaeraas <simen.kjaras@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |simen.kjaras@gmail.com


--- Comment #1 from Simen Kjaeraas <simen.kjaras@gmail.com> 2010-10-01 15:25:37 PDT ---
Could we please get this one fixed? Especially now with opDispatch, this is a painful one.

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Trass3r <mrmocool@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mrmocool@gmx.de


--- Comment #2 from Trass3r <mrmocool@gmx.de> 2010-10-29 03:52:29 PDT ---
Yeah opDispatch could be used for vector swizzling setters.

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--- Comment #3 from Simen Kjaeraas <simen.kjaras@gmail.com> 2010-10-31 12:29:14 PDT ---
Some hacking about showed me that opDispatch has a workaround for this problem, by using a two-layer approach:

template opDispatch( string name ) {
    auto opDispatch( T... )( T args ) {
        // Do something!
    }
}

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Andrei Alexandrescu <andrei@metalanguage.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |andrei@metalanguage.com
         AssignedTo|nobody@puremagic.com        |bugzilla@digitalmars.com


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Alex Khmara <alex.khmara@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alex.khmara@gmail.com


--- Comment #4 from Alex Khmara <alex.khmara@gmail.com> 2011-01-01 22:22:42 PST ---
(In reply to comment #3)
> Some hacking about showed me that opDispatch has a workaround for this problem, by using a two-layer approach:
> 
> template opDispatch( string name ) {
>     auto opDispatch( T... )( T args ) {
>         // Do something!
>     }
> }

This workaroung is only partial. This code produces "Error: s.opDispatch(T...)
has no value".

import std.stdio;

struct S {
    template opDispatch( string name ) {
        string opDispatch( T... )( T args ) {
            return "bar";
        }
    }
}

void main() {
    S s;
    string str = s.foo;
}

Same if I try "auto opDispatch" instead of "string".

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch
                 CC|                            |k.hara.pg@gmail.com


--- Comment #5 from Kenji Hara <k.hara.pg@gmail.com> 2011-07-29 06:29:13 PDT ---
I think this is not enhancement at least D2.
opDispatch for property syntax needs fixing this issue.

struct S
{
    template opDispatch(string name)
    {
        @property int opDispatch(A...)(A args)
        {
          static if (args.length)
            return args[0];
          else
            return 0;
        }
    }
}
void main()
{
    S s;
    s.prop == 0;  // Error: s.opDispatch(A...) has no value
}

I have posted D2 patch. https://github.com/D-Programming-Language/dmd/pull/280

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--- Comment #6 from github-bugzilla@puremagic.com 2012-01-26 12:06:20 PST ---
Commit pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/8bc639fb00cab9002b91a1d900ddd72f56f993a4 Merge pull request #280 from 9rnsr/propDispatch

Issue 620 - Can't use property syntax with a template function

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|0.175                       |D1


--- Comment #7 from Walter Bright <bugzilla@digitalmars.com> 2012-01-26 17:12:27 PST ---
Fixed for D2.

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Don <clugdbug@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
            Version|D1                          |D2
         Resolution|                            |FIXED


--- Comment #8 from Don <clugdbug@yahoo.com.au> 2012-11-12 23:48:20 PST ---
Closing since fixed on D2.

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