ERC165Checker

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Library used to query support of an interface declared via IERC165. Note that these functions return the actual result of the query: they do not revert if an interface is not supported. It is up to the caller to decide what to do in these cases.

State Variables

INTERFACE_ID_INVALID

bytes4 private constant INTERFACE_ID_INVALID = 0xffffffff;

Functions

supportsERC165

Returns true if account supports the IERC165 interface.

function supportsERC165(address account) internal view returns (bool);

supportsInterface

Returns true if account supports the interface defined by interfaceId. Support for IERC165 itself is queried automatically. See IERC165.supportsInterface.

function supportsInterface(address account, bytes4 interfaceId) internal view returns (bool);

getSupportedInterfaces

Returns a boolean array where each value corresponds to the interfaces passed in and whether they're supported or not. This allows you to batch check interfaces for a contract where your expectation is that some interfaces may not be supported. See IERC165.supportsInterface.

function getSupportedInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool[] memory);

supportsAllInterfaces

Returns true if account supports all the interfaces defined in interfaceIds. Support for IERC165 itself is queried automatically. Batch-querying can lead to gas savings by skipping repeated checks for IERC165 support. See IERC165.supportsInterface.

function supportsAllInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool);

supportsERC165InterfaceUnchecked

Query if a contract implements an interface, does not check ERC165 support

Assumes that account contains a contract that supports ERC165, otherwise the behavior of this method is undefined. This precondition can be checked with supportsERC165. Some precompiled contracts will falsely indicate support for a given interface, so caution should be exercised when using this function. Interface identification is specified in ERC-165.

function supportsERC165InterfaceUnchecked(address account, bytes4 interfaceId) internal view returns (bool);

Parameters

Returns

requireInterface

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Checks if a given contract at contractAddress supports the interface with ID interfaceId.

Uses the ERC-165 supportsInterface method. If the contract doesn't support the interface or doesn't implement ERC-165, the function will revert with a relevant error message.

function requireInterface(address contractAddress, bytes4 interfaceId) view;

Parameters