{
    "Function": "transfer",
    "File": "contracts/VoterID.sol",
    "Parent Contracts": [
        "interfaces/IVoterID.sol"
    ],
    "High-Level Calls": [],
    "Internal Calls": [
        "require(bool,string)",
        "require(bool,string)",
        "approve"
    ],
    "Library Calls": [],
    "Low-Level Calls": [],
    "Code": "function transfer(address from, address to, uint256 tokenId) internal {\n        require(owners[tokenId] == from, \"Identity: Transfer of token that is not own\");\n        require(to != address(0), \"Identity: transfer to the zero address\");\n\n        // Clear approvals from the previous owner\n        approve(address(0), tokenId);\n\n        owners[tokenId] = to;\n\n        // update balances\n        balances[from] -= 1;\n\n\n        // zero out two way mapping\n        uint ownershipIndex = ownershipMapTokenToIndex[from][tokenId];\n        ownershipMapTokenToIndex[from][tokenId] = 0;\n        if (ownershipIndex != balances[from]) {\n            uint reslottedToken = ownershipMapIndexToToken[from][balances[from]];\n            ownershipMapIndexToToken[from][ownershipIndex] = reslottedToken;\n            ownershipMapIndexToToken[from][balances[from]] = 0;\n            ownershipMapTokenToIndex[from][reslottedToken] = ownershipIndex;\n        } else {\n            ownershipMapIndexToToken[from][ownershipIndex] = 0;\n        }\n\n        // set two way mapping\n        ownershipMapIndexToToken[to][balances[to]] = tokenId;\n        ownershipMapTokenToIndex[to][tokenId] = balances[to];\n\n        balances[to] += 1;\n\n\n        emit Transfer(from, to, tokenId);\n    }"
}