How to simplify nested ifs

[drug]

On 16.03.2018 09:34, Satoshi wrote:
> 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.

I think that null conditional operator is intended for OOP only. It's 
really useful if your data field may be nullable. May be start review 
about this?