DIP6: Attributes

[Ary Borenszweig]

Sergey Gromov wrote:
> Tue, 04 Aug 2009 22:46:22 +1000, Daniel Keep wrote:
> 
>> Sergey Gromov wrote:
>>> Tue, 04 Aug 2009 17:22:50 +1000, Daniel Keep wrote:
>>>
>>>> Don wrote:
>>>>> ...
>>>>>
>>>>> A question: in C#/Java, can you have annotations on function pointer and
>>>>> delegate declarations?
>>>>>
>>>>> void foo( int delegate(int) pure dg) {
>>>>>   ...
>>>>> }
>>>>> What would this look like with annotations?
>>>> Well, Java doesn't HAVE delegates and C# doesn't (AFAIK) allow you to
>>>> define them inline; they have a special declaration syntax that can't be
>>>> used in an expression.
>>> C#:
>>>
>>> List<int> ls;
>>> ls.Sort((x, y) => y - x);
>>>
>>> or
>>>
>>> ls.Sort((x, y) => { int a; a = y; a -= x; return a; });
>> That's not a delegate type, that's a delegate literal.
> 
> Sorry, you said: "C# doesn't ... allow you to define them (delegates)
> inline".  Delegate literal *is* an inline definition of a delegate.
> What you say now is that C# doesn't allow to define a delegate type
> inside a function which is definitely true and is very annoying.

Have you seen the Func delegates? They are exactly for that.

The above example would be:

void foo(Func<int, int> dg) { ... }