43 lines
1.6 KiB
Solidity
43 lines
1.6 KiB
Solidity
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// SPDX-License-Identifier: CC0-1.0
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pragma solidity ^0.8.0;
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import "./IERC6150.sol";
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import "IERC721Enumerable.sol";
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/**
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* @title ERC-6150 Hierarchical NFTs Token Standard, optional extension for enumerable
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* @dev See https://eips.ethereum.org/EIPS/eip-6150
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* Note: the ERC-165 identifier for this interface is 0xba541a2e.
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*/
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interface IERC6150Enumerable is IERC6150, IERC721Enumerable {
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/**
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* @notice Get total amount of children tokens under `parentId` token.
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* @dev If `parentId` is zero, it means get total amount of root tokens.
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* @return The total amount of children tokens under `parentId` token.
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*/
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function childrenCountOf(uint256 parentId) external view returns (uint256);
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/**
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* @notice Get the token at the specified index of all children tokens under `parentId` token.
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* @dev If `parentId` is zero, it means get root token.
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* @return The token ID at `index` of all chlidren tokens under `parentId` token.
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*/
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function childOfParentByIndex(
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uint256 parentId,
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uint256 index
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) external view returns (uint256);
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/**
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* @notice Get the index position of specified token in the children enumeration under specified parent token.
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* @dev Throws if the `tokenId` is not found in the children enumeration.
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* If `parentId` is zero, means get root token index.
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* @param parentId The parent token
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* @param tokenId The specified token to be found
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* @return The index position of `tokenId` found in the children enumeration
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*/
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function indexInChildrenEnumeration(
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uint256 parentId,
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uint256 tokenId
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) external view returns (uint256);
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}
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