I need an Easy example to understand Alias This

[Marcone]

On Tuesday, 7 July 2020 at 00:42:40 UTC, Ali Çehreli wrote:
> On 7/6/20 5:35 PM, Marcone wrote:
>> Hi, I study Dlang for one year, and I can't understand alias 
>> this. I need an Easy example to understand Alias This.
>
> Is the following example useful?
>
>   http://ddili.org/ders/d.en/alias_this.html
>
> Ali

I can't undestand it. I need a simple example.