Re: Asserting that a base constructor is always called

[Ali Çehreli via Digitalmars-d-learn]

On 5/23/20 3:04 PM, Tim wrote:

I have a base class GameObject:

/// Base class of most objects in the game
class GameObject{
     this(){
         world[layer] = this;
     }

     abstract void update(){}

     void draw(){}
}

I want to make sure that whenever a class inherits from this, the base constructor is always called. Either that or have an assertion that gives an error if it isn't called.

Thanks

Is it not already called? I tried the following and it seems to work:

import std.stdio;

GameObject[1] world;
enum layer = 0;

/// Base class of most objects in the game
class GameObject{
  this(){
    world[layer] = this;
    writeln("called");
  }

  abstract void update(){}

  void draw(){}
}

class A : GameObject {
  this(int i) {
    writeln(__FUNCTION__);
  }

  override void update() {
  }
}

void main() {
  auto a = new A(42);
}

Ali