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Link to mentioned Solidity bug

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William Entriken 2018-02-26 11:13:12 -05:00 committed by GitHub
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EIPS/eip-721.md
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@ -381,7 +381,7 @@ Example deeds implementations as of February 2018:
Note: "Limited edition, collectible tokens" like [Curio Cards](https://mycuriocards.com/) and [Rare Pepe](https://rarepepewallet.com/) are *not* deeds. They're actually a collection of individual fungible tokens, each of which is tracked by its own smart contract with its own total supply (which may be `1` in extreme cases).
The `onNFTReceived` function specifically works around old deployed contracts which may inadvertently return 1 (`true`) in certain circumstances even if they don't implement a function. By returning, and checking for, a magic value we are able to distinguish actual affirmative responses versus these `true`s.
The `onNFTReceived` function specifically works around old deployed contracts [which may inadvertently return 1 (`true`)](http://solidity.readthedocs.io/en/develop/bugs.html#DelegateCallReturnValue) in certain circumstances even if they don't implement a function. By returning, and checking for, a magic value we are able to distinguish actual affirmative responses versus these `true`s.
## Test Cases