Is it possible to force CTFE?

[Tommi]

On Sunday, 10 June 2012 at 10:16:23 UTC, jerro wrote:
>
> No, but you could wrap it in a template to force it to always
> execute at compile time.

So, I just realized, I could have just this one convenience 
template that I can use whenever I want to force an expression to 
be evaluated at compile-time. Like so:

template ct(alias expr)
{
      enum ct = expr;
}

int fun(int a, int b)
{
      return a + b;
}

//... and use it like:

ct!(fun(1, 2))

That's not *too* inconvenient. Although, best would be a function 
attribute that would force the compiler to apply ctfe 
aggressively whenever it can with calls to that function.