D's auto keyword

[Justin Johansson]

downs wrote:
> Justin Johansson wrote:
>> Happy New Year 2010 Everybody.
>>
>> Having resumed C++ nationality for the last few months, I kind of miss D's auto keyword.
>>
> 
> If you're on gcc or a compiler that allows the typeof extension:
> 
> #define DECL(A, B) typeof(B) A = B
> 
> :)

Thanks. I uncovered the keyword recently when I inadvertently typed 
"typeof" instead of "typeid" and the editor in Eclipse CDT made no 
complaint.  Consequently I searched both web and boost source for
for usages of typeof and soon found that it was just an extension
for gcc (and perhaps some others).

It's a real pity for C++ that typeof keyword hasn't been standardized. 
Accordingly Boost doesn't use typeof.  However, I noticed that they 
sometimes make some use of the 
"typedef-decl-nested-inside-a-class-or-struct-trick" to exact static
type on occasions when typeof would otherwise suffice.

Cheers
Justin Johansson