Bundle ERC721 extensions into base contract #2149
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Also, I haven't yet updated the documentation generators, so some links will be broken. I'll address that once we have the final code in place. |
frangio
reviewed
Mar 27, 2020
Co-Authored-By: Francisco Giordano <[email protected]>
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Part of #2086.
The goal behind this initiative is to have all optional extensions for tokens baked into the base implementation (that is, for
ERC20to includeERC20Detailed, andERC721to include bothERC721MetadataandERC721Enumerable). These optional extensions were often (always?) used along the base implementation, and the changes in Solidity around inheritance mean that forcing our users to use multiple inheritance create unnecessary friction.As a side effect, we should be able to use the newly added
EnumerableSetand the proposals aroundEnumerableMap(#2072) to improve code readability, gas efficiency and overall security.Because the tokens are some of the library's biggest contracts, these changes are not trivial. I thought it best to approach this in a step-by-step manner, by:
This PR contains just the first step of the three described above. To make reviewing easier, I split the changes to the contracts code in different commits. The tests refactor is unfortunately hard to review, though I am confident it was performed correctly (I copy-pasted the tests from ERC721.behavior and ERC721Full.test into ERC721.test).