Compile time function execution...

[Brian Byrne]

I'm having a few problems getting some simple examples to work, for 
instance:

-----
char[] foo() { return( "bar" ); }
void main() { const char[] bar = foo(); }

Assertion failure: 'parameters && parameters->dim == dim' on line 96 in 
file 'interpret.c'

abnormal program termination
-----

and

-----
template eval( A... ) { alias A eval; }
int square( int n ) { return( n * n ); }
void main() { int bar = eval!( square( 5 ) ); }

Error: cannot implicitly convert expression (tuple25) of type (int) to int
-----

What am I doing wrong?

Thanks,
Brian Byrne






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.