ctor not inhrited in a classes

[Zaher Dirkey]

I discussed this on IRC before years but i didnt get good answer.

Let assume I have library that used by my coworkers

In the example bellow my coworkers used SubBaseClass to create 
their classes, in first version of my code I dont have ctor with 
arg, and everything is fine,
but later i added parent to it and i want SubBaseClass and (child 
  classes) not created without parent value, i want to force them 
to do that.

what happen the new ctor not inhrited to child classes, and 
coworkers still can create it using (new) without parameters, we 
have alot of child classes,
I want compiler stop compiling if parent not defined.


import std.stdio;

class SuperClass {
     this(){

     }
}


class SubBaseClass: SuperClass {

     this(){

     }

     SubBaseClass parent;

     this(SubBaseClass Parent) {
       //some code to use parent etc
       writeln("childclass ctor");
     }
}

//CoWorkers or who are using my lib

class ChildBaseClass1: SubBaseClass {
}

class ChildBaseClass2: SubBaseClass {
}


void main()
{
	//compiled
     ChildBaseClass1 a = new ChildBaseClass1();
     ChildBaseClass2 b = new ChildBaseClass2();

     //error:is not callable using argument types
     //but i need to force to use to init varables
     ChildBaseClass1 a = new ChildBaseClass1(null);
     ChildBaseClass2 b = new ChildBaseClass2(a);

}