Expanding CTFE code during compilation

[Steven Schveighoffer]

On 7/19/22 5:43 PM, Azi Hassan wrote:

> Just in case this is a consequence of the XY problem, the reason why I'm 
> looking for this is to make sure that the code I wrote did evaluate to 
> what I'm expecting it to. Right now I do this with an enum assignment 
> followed by static asserts, but I'd love it for there to be some sort of 
> visual feedback.
> 
> Thanks in advance


```d
template printEnum(alias x, string file = __FILE__, size_t line = __LINE__)
{
    enum printEnum = x;
    pragma(msg, file, "(", int(line), "): ", printEnum);
}

enum x = printEnum!(iota(1, 5).reduce!"a * b");
```

This will spit out the file, line, and value for the declaration. 
Assuming this is useful for your double-checking you could do this, and 
then switch it back when you have verified that it's correct.

-Steve