"if not" condition check (for data validation)

[Denis]

On Thursday, 18 June 2020 at 12:50:35 UTC, Stanislav Blinov wrote:
> No, there isn't a way to write an operator.

OK, first choice eliminated.

On Thursday, 18 June 2020 at 13:57:39 UTC, Dukc wrote:
> No reason to use templates here
>
> pragma(inline, true) auto not(bool cond) { return !cond(); }

I like it. The inline pragma eliminates the extra overhead of the 
function call, which was another objective. (And it introduces me 
to D's pragmas too.)

Personally, I find this:

   if ( not( abra && cadabra )) ...

to be more clear than:

   if ( !( abra && cadabra )) ...

I guess it depends on what one is used to. I do recognize that 
this would be non-standard for D, but I'm still going to use it 
because I find it more readabile.

I should add that this one made me laugh though, giving 
flashbacks to that horrible "not speak" of the early 90s:

   if ( configfile.isFile.not ) ...

LOL

I've learned multiple things from this posting. Thank you all for 
sharing your suggestions.

Denis