Ethereum Smart Contract Development

Inheritance

Solidity imitates the Python language, in the context of inheritance. It supports general inheritance, multiple inheritance, and polymorphism. In simple words, inheritance is the property where a contract copies properties from a parent contract. In the case of multiple inheritance, a contract copies properties from more than one contract. Polymorphism denotes a general contract that can be reused by many other contracts.

For example, a contract, eat(), can be used by both human() contract and birds(), as well as animal() contracts. In solidity, IS is the keyword used for inheritance of contracts.

Multiple inheritances sometimes lead to deadlock problems. Figure 6.6 illustrates this problem in terms of solidity, which gives the ...