Resources

People often ask me "How did you learn how to hack?" The answer: by reading. This page is a collection of the blog posts and other articles that I have accumulated over the years of my journey. Enjoy!

Inheritance is straight forward until its not. What do you do when a diamond is created from inheritance. For instance, if we have contract A, contract B & C which inherit from contract A and contract D which inherits from B & C. Weird problem to have. The solution to this in Solidity is C3, which is also used by Python.

The algorithm guarantees that the method of resolution is uniform throughout the inheritance hierarchy. Additionally, it's expected that method calls and attribute lookups work in this scenario as well.

The goal of the Linearization is to make this a linear hierarchy. As a result, the inheritance flow will turn into [D,C,B,A]. Crazy enough, C is now a direct descendant of B! Although this is not the EXACT interruption that you would expect, it's better than the program not compiling.

Constructors for the parent contracts are always executed in the C3 order. Changing the order of constructor execution within the child constructor doesn't effect this at all. Additionally, a parent with a constructor and no arguments is automatically invoked, even if it's not explicitly invoked by the child. There is an example in the code of this for the Ownable contract.

Overall, a pretty interesting article on how inheritance works in Solidity. Probably been a few bugs in the past as a result of this.