User Defined Attributes

[Sönke Ludwig]

Am 06.11.2012 16:55, schrieb Jacob Carlborg:
> On 2012-11-06 16:39, Walter Bright wrote:
>> On 11/6/2012 5:04 AM, Jacob Carlborg wrote:
>>> I agree, I a syntax like this would have been nicer:
>>>
>>> @mtype("key" : "value") int a; or @mtype(key : "value") int a;
>>> @mtype("value") int b;
>>> @mtype int c;
>>>
>>
>> Part of what I was trying to do was minimizing inventing new syntaxes.
>> The
>>
>>     [ ArgumentList ]
>>
>> invents nothing new but the brackets. Your proposal is both a new
>> syntax, and it can only do key/value pairs - nothing else.
> 
> It depends on how you look at it.
> 
> * @mtype - is the same syntax as the current syntax for attributes
> * @mtype("key" : "value") - Uses the above in combination with the
> syntax for associative array literals
> 
> How about this then:
> 
> @mtype("foo", 3, "bar") int a;
> 
> And have the argument list be optional? I really like to have a short
> nice looking syntax for the simple use cases, i.e.
> 
> @mtype int b;
> 

+1

Also, if mtype is a template, it could naturally be @mtype!(1, 2, 3).
Without the '!' it would be a function that is evaluated at CT. And just
@mtype would yield an alias of mtype.