Blockchain Developer's Guide

Inheritance

Solidity supports multiple inheritance by copying code including polymorphism. Even if a contract inherits from multiple other contracts, only a single contract is created on the blockchain; the code from the parent contracts is always copied into the final contract.

Here is an example to demonstrate inheritance:

contract sample1 {     function a(){}     function b(){} } //sample2 inherits sample1 contract sample2 is sample1 {     function b(){} } contract sample3 {     function sample3(int b)     {     } } //sample4 inherits from sample1 and sample2 //Note that sample1 is also parent of sample2, yet there is only a single instance of sample1  contract sample4 is sample1, sample2 {     function a(){}     function c(){  //this executes the "a" method of ...