DMD 0.170 release

[Bill Baxter]

Tom S wrote:
> Bill Baxter wrote:
>> Seriously?  Is there no way to write the function below so that the 
>> program prints out the same value twice?
>>
>> void print_addr( ??? arg )
>> {
>>    writefln(&arg);
>> }
>>
>> void main()
>> {
>>     int[] arr = [1,2,3,4,5];
>>     writefln(&arr);
>>     print_addr(arr);
>> }
> 
> Sure it's possible, but in the earlier case, you were trying to access 
> stack variables after returning from the function. In the same manner, 
> 'arg' is no longer a valid variable after print_addr returns, you'd be 
> referencing junk on the stack. You could store it in a static variable, 
> but I consider it hackish, as it's not thread safe :)

Right, but really I don't want to access 'arg' I want to access the 
'arr' in the outer scope.

In C++ I would just make it a reference parameter, and take the address:

void print_addr( IntArrayType& arg )
{
     writefln(&arg);
}
void main()
{
     int[] arr = [1,2,3,4,5];
     writefln(&arr);
     print_addr(arr);
}

Then aside from the fact that D is not C++, it would print the same 
value for both, and it wouldn't be accessing a static variable.  And it 
would be perfectly thread safe.

--bb