How to create instance of class that get data from 2 another instance?

[Suliman via Digitalmars-d-learn]

> I think it's fine to have a global config instance. 
> Alternatively you can pass the config to both the 
> seismoDownlead and MySqlWhatever classes.
>
> // there ist enforce(cond, msg) for this in 
> std.exception/std.conv, dunno.
> if (!exists(confpath))  throw new Exception("ERROR: config.ini 
> do not exists");
> // it becomes
> enforce(exists(confpath), "ERROR: config.ini does not exist");

Not fully understand. How I need to declare global config 
instance?

void main()
{
	
}

this()
{
	auto parseconfig = new parseConfig();
}

But how this() will be called in nothing in main?

And I can't understand how to pass the config to both the 
seismoDownlead and MySqlWhatever classes.

I know how to pass, but I do not understand how to do it with 
current situation with scopes.

Here is current version of my code. I am not asking to do work 
for me, but could you show what and where I should move 
http://www.everfall.com/paste/id.php?oscnkeq740ue

?