Solidity Programming Essentials

Method overriding

Method overriding refers to redefining a function available in the parent contract having the same name and signature in the derived contract. The next code segment shows this. A parent contract contains two functions, SetInteger and GetInteger. A child contract inherits from the parent contract and provides its own implementation of GetInteger by overriding the function.

Now, when a call to the GetInteger function is made on the child contract even while using a parent contract variable, the child contract instance function is invoked. This is because all functions in contracts are virtual and based on contract instance; the most derived function is invoked, as shown in the following screenshot: