On 04/18/2012 03:50 PM, Mirko Pilger wrote:
>> I want to know what is most interesting for me: delegates or functions.
>> I consulted sources but none say the practical consequences of such
>> election.
>
> in addition to what john said: regarding _function literals_ the
> difference is by using a delegate instead of a function you have access
> to the enclosing frame, e.g. variables in the same scope.
>
> the following code doesn't compile with the error "[...] cannot access
> frame of [...]":
>
> int y;
> auto fn= function(int x) {return x+y;};
>
> if you change this to:
>
> int y;
> auto fn= delegate(int x) {return x+y;};
>
> it compiles without error.
Additionally, thanks to a recent bug fix, omitting 'function' and
'delegate' will deduce the right one. Both of the following are
delegates because they access the variable 'y' from the enclosing scope:
auto fn_1 = (int x) {return x+y;};
auto fn_2 = (int x) => x + y;
The latter syntax doesn't help much in this context but still...
Ali
