August 2019
Intermediate to advanced
486 pages
13h 52m
English
Content preview from Mastering Blockchain Programming with Solidity
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Utility contracts
The OpenZeppelin library provides some utility contracts that can be used for general purpose functions, such as checking that an address is a contract, or a modifier to prevent reentrancy attacks.
The contract library files are in the Chapter09/openzeppelin-solidity/contracts/utils folder.