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43 lines
1.3 KiB
Solidity
43 lines
1.3 KiB
Solidity
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165Storage.sol)
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pragma solidity ^0.8.0;
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import "./ERC165.sol";
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/**
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* @dev Storage based implementation of the {IERC165} interface.
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*
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* Contracts may inherit from this and call {_registerInterface} to declare
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* their support of an interface.
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*/
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abstract contract ERC165Storage is ERC165 {
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/**
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* @dev Mapping of interface ids to whether or not it's supported.
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*/
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mapping(bytes4 => bool) private _supportedInterfaces;
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/**
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* @dev See {IERC165-supportsInterface}.
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*/
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function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
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return super.supportsInterface(interfaceId) || _supportedInterfaces[interfaceId];
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}
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/**
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* @dev Registers the contract as an implementer of the interface defined by
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* `interfaceId`. Support of the actual ERC165 interface is automatic and
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* registering its interface id is not required.
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*
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* See {IERC165-supportsInterface}.
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*
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* Requirements:
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*
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* - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
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*/
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function _registerInterface(bytes4 interfaceId) internal virtual {
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require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
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_supportedInterfaces[interfaceId] = true;
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}
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}
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