mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
50 lines
1.6 KiB
Solidity
50 lines
1.6 KiB
Solidity
interface ERC165 {
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/// @notice Query if a contract implements an interface
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/// @param interfaceID The interface identifier, as specified in ERC-165
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/// @dev Interface identification is specified in ERC-165. This function
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/// uses less than 30,000 gas.
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/// @return `true` if the contract implements `interfaceID` and
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/// `interfaceID` is not 0xffffffff, `false` otherwise
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function supportsInterface(bytes4 interfaceID) external view returns (bool);
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}
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contract ERC165MappingImplementation is ERC165 {
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/// @dev You must not set element 0xffffffff to true
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mapping(bytes4 => bool) internal supportedInterfaces;
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constructor() internal {
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supportedInterfaces[this.supportsInterface.selector] = true;
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}
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function supportsInterface(bytes4 interfaceID) external view override returns (bool) {
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return supportedInterfaces[interfaceID];
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}
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}
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interface Simpson {
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function is2D() external returns (bool);
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function skinColor() external returns (string memory);
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}
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contract Lisa is ERC165MappingImplementation, Simpson {
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constructor() public {
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supportedInterfaces[type(Simpson).interfaceId] = true;
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}
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function is2D() external override returns (bool) {
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return true;
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}
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function skinColor() external override returns (string memory) {
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return "yellow";
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}
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}
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// ====
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// compileViaYul: also
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// ----
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// supportsInterface(bytes4): left(0x01ffc9a0) -> false
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// supportsInterface(bytes4): left(0x01ffc9a7) -> true
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// supportsInterface(bytes4): left(0x73b6b492) -> true
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// supportsInterface(bytes4): left(0x70b6b492) -> false
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