Problem with closures

[Lutger]

Alain wrote:
> Frits van Bommel Wrote:
> 
>> Alain wrote:
>>> AddFunc addN(int n) {
>>>     int add(int i) {
>>>         return i + n;
>>>     }
>>>     return &add; // the add function captured will remember the value of n
>>> }
>> [snip]
>>> Am i missing something?
>> You shouldn't return delegates to nested functions, just like you 
>> shouldn't return pointers to local variables.
>> Delegates to nested functions contain a pointer to the stack frame of 
>> the enclosing function. If that function has returned, the stack frame 
>> may be corrupted (especially if you have called another function, like 
>> apply(), since then).
> 
> How come this compiles? Is it a bug ?
> 
> Alain

This is valid code. It is up to the programmer to make sure the delegate 
  doesn't use vars that are out of scope. There was some talk about 
this, to copy the 'evironment' for later use, it might be solved in the 
future.

std.bind might be of use here.