[phobos] Converting function pointers to delegates

[Walter Bright]

Language support for it won't be for a while, so adding it to Phobos is 
more appropriate for now.

Andrei Alexandrescu wrote:
> Looks good. Long term the conversion function -> delegate should be 
> put in the language, but David's code seems to do the trick for the 
> time being.
>
> I'll leave this up to Walter. Walter, do you have the time to 
> implement  the function -> delegate implicit conversion? If not, I 
> suggest we let David add his code to Phobos, either in std.typecons or 
> std.functional. One personal preference: instead of delegateFromFunc I 
> prefer toDelegate as it's a tad more in sync with other names.
>
> Thanks David!
>
>
> Andrei
>
> David Simcha wrote:
>> A pretty significant wart of D is that function pointers and 
>> delegates are completely incompatible.  I've come up with a good hack 
>> to convert function pointers to delegates without any heap 
>> allocations or additional storage besides the delegate itself being 
>> used.  In particular, there are no heap allocations, closures, etc. 
>> involved.  However, calling a delegate created from a function 
>> pointer does still incur two indirect function calls instead of one.  
>> I've attached the code.  Tell me what you think.
>>
>>
>> ------------------------------------------------------------------------
>>
>> _______________________________________________
>> phobos mailing list
>> phobos at puremagic.com
>> http://lists.puremagic.com/mailman/listinfo/phobos
> _______________________________________________
> phobos mailing list
> phobos at puremagic.com
> http://lists.puremagic.com/mailman/listinfo/phobos
>
>