How to simplify nested ifs

[Satoshi]

On Tuesday, 13 March 2018 at 12:23:06 UTC, Ozan Süel wrote:
> Hi
>
> I have a construction like the following
>
> if (source) {
>   if (source.pool) {
>     if (source.pool.repository) {
>       if (source.pool.repository.directory) {
> 	if (source.pool.repository.directory.users) {
> 	  // do something
>
> Any chance to simplify this nested ifs?
> I know some languages has a way like.
>
> if (source?pool?repository?directory?users) // do something
>
>
> Similar ways in D?
>
> Thanks and Regards, Ozan

null conditional operators are not implemented in D because, as a 
(I think Walter) said, D is not language designed to work with 
classes or advanced OOP stuff. Nobody uses it, so please, if you 
are using it, stop and use structs and meta programming instead.