Compile time function execution...

[Michiel]

Walter Bright wrote:

> ... is now in DMD 1.006. For example:
> 
>> -------------------------------------------
>> import std.stdio;
>>
>> real sqrt(real x)
>> {
>>    real root = x / 2;
>>    for (int ntries = 0; ntries < 5; ntries++)
>>    {
>>        if (root * root - x == 0)
>>            break;
>>        root = (root + x / root) / 2;
>>    }
>>    return root;
>> }
>>
>> void main()
>> {
>>    static x = sqrt(10);   // woo-hoo! set to 3.16228 at compile time!
>>    writefln("%s, %s", x, sqrt(10));  // this sqrt(10) runs at run time
>> }
>> ------------------------------------------
> 
> This should obsolete using templates to compute values at compile time.


That's a great feature! A couple of questions, if I may:

* Can sqrt still call another function?

* Does it still work if classes or structs are involved in any way? What
about enums? What about arrays?

* Why is the second sqrt(10) run at runtime? In theory it's still a
constant, right? Is this something that will work in a later version?

Congrats on the new feature!