Remove enumerable from ERC721 and add an ERC721Enumerable extension #2511
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Average gas usage given by eth-gas-reporter
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…ntracts into feature/ERC721Light
frangio
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Feb 18, 2021
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| if (from == address(0)) { | ||
| _addTokenToAllTokensEnumeration(tokenId); | ||
| } else if (from != to) { | ||
| _removeTokenFromOwnerEnumeration(from, tokenId); | ||
| } | ||
| if (to == address(0)) { | ||
| _removeTokenFromAllTokensEnumeration(tokenId); | ||
| } else if (to != from) { | ||
| _addTokenToOwnerEnumeration(to, tokenId); | ||
| } |
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I think this is a little clearer.
Suggested change
| if (from == address(0)) { | |
| _addTokenToAllTokensEnumeration(tokenId); | |
| } else if (from != to) { | |
| _removeTokenFromOwnerEnumeration(from, tokenId); | |
| } | |
| if (to == address(0)) { | |
| _removeTokenFromAllTokensEnumeration(tokenId); | |
| } else if (to != from) { | |
| _addTokenToOwnerEnumeration(to, tokenId); | |
| } | |
| if (from == address(0)) { | |
| _addTokenToAllTokensEnumeration(tokenId); | |
| } | |
| if (to == address(0)) { | |
| _removeTokenFromAllTokensEnumeration(tokenId); | |
| } | |
| if (to != from) { | |
| _removeTokenFromOwnerEnumeration(from, tokenId); | |
| _addTokenToOwnerEnumeration(to, tokenId); | |
| } |
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this would not work:
_removeTokenFromOwnerEnumeration(from, tokenId);must not be called iffrom == address(0)_addTokenToOwnerEnumeration(to, tokenId);must not be called ifto == address(0)
Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
frangio
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EnumerableSet and EnumerableMap heavily rely on sstore & sload, which are very expensive operations. At the same time, the Enumerable aspect can be tracked offchain using tools like thegraph.
Developer should have the choice between having this enumerable functionality (and pay the gas price), or drop it if onchain access to these information is sufficient.
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