Problem with closures

[Chris Nicholson-Sauls]

Bradley Smith wrote:
> Nevermind. I figured it out. The following works.
> 
> import std.stdio;
> 
> alias int delegate(int n) AddFunc;
> 
> template addN(int N) {
>   AddFunc addN() {
>     return delegate int (int i) { return i + N; };
>   }
> }
> 
> void apply (int[] array, AddFunc func) {
>   foreach (inout i; array) {
>     i = func(i);
>   }
> }
> 
> void main () {
>     int[] numbers = [1,2,3] ;
>     writefln("numbers before = ", numbers);
>     apply(numbers, addN!(40));
>     writefln("numbers after = ", numbers);
> }
> 
> Bradley Smith wrote:
>> Using DMD 1.0, I get errors on the template.
>>
>> closureWithTemplate.d(19): delegate 
>> closureWithTemplate.TAddN!(40).__dgliteral2 is a nested function and 
>> cannot be accessed from main
>> closureWithTemplate.d(6): Error: non-constant expression __dgliteral2
>>
>>
>>   Bradley
>>
>> Chris Nicholson-Sauls wrote:
>>> import std .stdio ;
>>>
>>> alias int delegate(int n) AddFunc;
>>>
>>> template TAddN (int N) {
>>>   const TAddN = (int i) { return i + N; } ;
>>> }
>>>
>>> void apply (int[] array, AddFunc func) {
>>>   foreach (inout i; array) {
>>>     i = func(i);
>>>   }
>>> }
>>>
>>> void main () {
>>>     int[] numbers = [1,2,3] ;
>>>
>>>     writefln("numbers before = ", numbers);
>>>     apply(numbers, TAddN!(40));
>>>     writefln("numbers after = ", numbers);
>>> }

Now that, actually, I consider possibly a bug.  But a least the workaround was simple 
enough (and small enough to be inlined).

-- Chris Nicholson-Sauls