How can I dump an expression into log and execute it

[sigod via Digitalmars-d]

On Friday, 11 July 2014 at 01:35:41 UTC, Delorien wrote:
> Hi,
>
> I have a C macro, which takes an argument, log it and call a 
> function.
> So, if I had a source code like this:
>
> {
>   _logfx(x + 10);
> }
>
> the actual code would be
>
>   DebugLog("x + 10");
>   fx(x + 10);
>
> Can I make similar tricks in the D language?
>
> Thank you.

Something like this would be possible if one could get string 
representation of a lazy expression:
```
void _logfx(lazy int expr)
{
     DebugLog(expr.stringof); // currently it outputs `expr()`
     fx(expr);
}
```