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openzeppelin-contracts/contracts/token/ERC721/README.adoc
Nicolás Venturo d9fa59f30a Address ERC1155 changes (#2267)
* Make holder fns public

* Add context, remove msg.sender from check

* Fix location of Holder arguments

* Add beforeTransfer hook

* Minor test improvements

* Add ERC1155Burnable and tests

* Add ERC1155Pausable

* Add ERC1155PresetMinterPauser.sol

* Add uri constructors

* Improved revert reasons

* Initial docs improvements

* Add missing docs

* Improve acceptance checks revert reasons

* Apply suggestions from code review

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

* Remove note about 1155 preset uri in mint

* Add rquirements to balanceOfBatch

* Add note about URI and uri

* Fix list in docs

* Fix lint errors

* Use natural sorting for API titles

* Fix doc references

* Escape {id} references to remove docgen warnings

* Added intro docs, fixed links

* Apply suggestions from code review

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

* Add changelog entry

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
2020-06-09 14:47:51 -03:00

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= ERC 721
This set of interfaces, contracts, and utilities are all related to the https://eips.ethereum.org/EIPS/eip-721[ERC721 Non-Fungible Token Standard].
TIP: For a walkthrough on how to create an ERC721 token read our xref:ROOT:erc721.adoc[ERC721 guide].
The EIP consists of three interfaces, found here as {IERC721}, {IERC721Metadata}, and {IERC721Enumerable}. Only the first one is required in a contract to be ERC721 compliant. However, all three are implemented in {ERC721}.
Additionally, {IERC721Receiver} can be used to prevent tokens from becoming forever locked in contracts. Imagine sending an in-game item to an exchange address that can't send it back!. When using <<IERC721-safeTransferFrom,`safeTransferFrom`>>, the token contract checks to see that the receiver is an {IERC721Receiver}, which implies that it knows how to handle {ERC721} tokens. If you're writing a contract that needs to receive {ERC721} tokens, you'll want to include this interface.
Additionally there are multiple custom extensions, including:
* designation of addresses that can pause token transfers for all users ({ERC721Pausable}).
* destruction of own tokens ({ERC721Burnable}).
== Core
{{IERC721}}
{{IERC721Metadata}}
{{IERC721Enumerable}}
{{ERC721}}
{{IERC721Receiver}}
== Extensions
{{ERC721Pausable}}
{{ERC721Burnable}}
== Convenience
{{ERC721Holder}}