August 2019
Intermediate to advanced
486 pages
13h 52m
English
Content preview from Mastering Blockchain Programming with Solidity
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Creating custom reusable libraries
The libraries in Solidity are just like contracts, but they are deployed only once and their code is reused in the calling contracts. You can define libraries using the library keyword. Calls to the library functions use the DELEGATECALL opcode, which means that when a function on a library is called by the contract, only the code of the library function is executed in the context of the calling contract, and the storage of the calling contract is used and modified by the library. The library can have pure and view functions, which will be accessible directly from the calling contract because they do not initiate DELEGATECALL. You cannot destroy a deployed library.
When a library is linked to a contract, ...
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