Why it doesn't compile in D 2.0?

[Simen kjaeraas]

aarti_pl <aarti at interia.pl> wrote:

>
> class Test {
>      string t1 = "test";		//Ok!
>      char[] t2 = "test".dup;	//Compile error
> }
>
> void main(char[][] args) {
> }
>
> Error:
> hello.d(3): Error: cannot evaluate _adDupT((&  
> D12TypeInfo_Aya6__initZ),"test") at compile time
> hello.d(3): Error: cannot evaluate _adDupT((&  
> D12TypeInfo_Aya6__initZ),"test") at compile time
>
> Is there workaround?

Constant strings are saved in the static data segment of the executable, so
the .dup call would need to be executed at runtime. In other words, what
this would do is cast const to mutable.

If this did compile, changing the contents of t2 would change those  
contents
for all instances of Test, which I assume is not your intention.

As for the workaround, write a constructor:

class Test {
   string t1 = "test";
   string t2;

   this( ) {
     t2 = "test".dup;
   }
}

-- 
Simen