DCIPs/assets/eip-6150/contracts/ERC6150Enumerable.sol

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// SPDX-License-Identifier: CC0-1.0
pragma solidity ^0.8.0;
import "./ERC6150.sol";
import "./interfaces/IERC6150Enumerable.sol";
abstract contract ERC6150Enumerable is ERC6150, IERC6150Enumerable {
function childrenCountOf(
uint256 parentId
) external view virtual override returns (uint256) {
return childrenOf(parentId).length;
}
function childOfParentByIndex(
uint256 parentId,
uint256 index
) external view virtual override returns (uint256) {
uint256[] memory children = childrenOf(parentId);
return children[index];
}
function indexInChildrenEnumeration(
uint256 parentId,
uint256 tokenId
) external view virtual override returns (uint256) {
require(parentOf(tokenId) == parentId, "wrong parent");
return _getIndexInChildrenArray(tokenId);
}
}