September 2019
Beginner to intermediate
540 pages
13h 3m
English
Content preview from Learn Ethereum
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Multiple inheritance and the diamond problem
The diamond problem refers to the case where one contract extends from two other contracts, and both extend from a common parent contract, as shown here:
Solidity follows the path Python is taking when it comes to resolving the diamond problem and uses C3 linearization to force a certain kind of order in the base classes.
We can see the following in the following code snippet:
- Both B and C extend A, while D extends B and C in that order, where B is the most likely base for D, but also requests C to override B in the case of conflicts.
- Contract E is allowed since E extends A and B, and B is a subcontract ...
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