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Function selectors are defined by Ethereum, not Solidity

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William Entriken 2018-02-16 06:58:03 -05:00 committed by GitHub
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EIPS/eip-165.md
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@ -31,7 +31,7 @@ For some "standard interfaces" like [the ERC-20 token interface](https://github.
### How Interfaces are Identified
For this standard, an *interface* is a set of [function selectors as calculated in Solidity](http://solidity.readthedocs.io/en/develop/abi-spec.html#function-selector). This a subset of [Solidity's concept of interfaces](http://solidity.readthedocs.io/en/develop/abi-spec.html) and the `interface` keyword definition which also define return types, mutability and events.
For this standard, an *interface* is a set of [function selectors as defined by the Ethereum ABI](http://solidity.readthedocs.io/en/develop/abi-spec.html#function-selector). This a subset of [Solidity's concept of interfaces](http://solidity.readthedocs.io/en/develop/abi-spec.html) and the `interface` keyword definition which also define return types, mutability and events.
We define the interface identifier as the XOR of all function selectors in the interface. This code example shows how to calculate an interface identifier: