Re: Anyone know why this CTFE isn't working?

[Rory McGuire]

On Fri, 16 Jul 2010 11:58:57 +0200, Lars T. Kyllingstad  
<pub...@kyllingen.nospamnet> wrote:

On Fri, 16 Jul 2010 11:46:48 +0200, Rory McGuire wrote:
import std.stdio;

struct State {
  string s; string getString() { return s; } static State opCall(string
  s) {
  State ret;
  ret.s = s;
  return ret;
  }
}

void main() {
  auto s = State("adf");
  pragma(msg, s.getString());
}

dmd Output: (line 14 is the pragma statement)

struct.d(14): Error: variable s cannot be read at compile time
struct.d(14): Error: cannot evaluate s.getString() at compile time
s.getString()

It's not working because s isn't a compile-time quantity.  Try:

  enum s = State("adf");

-Lars

Awesome thanks, worked.

So is the difference that "auto s" is a Struct which can change whereas  
"enum s" is a constant?
If it is a constant its just "s" that is constant right?

Thanks Lars


-Rory