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Created February 9, 2019 07:01
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ERC721XTokenNFT.sol modification for tokenType mapping
mapping(uint256 => uint256) tokenType;
uint256 constant NFT = 1;
uint256 constant FT = 2;
/**
* @dev Returns whether the specified token exists
* @param _tokenId uint256 ID of the token to query the existence of
* @return whether the token exists
*/
function exists(uint256 _tokenId) public view returns (bool) {
// address owner = tokenOwner[_tokenId];
// return owner != address(0);
return tokenType[_tokenId] != 0;
}
function _mint(uint256 _tokenId, address _to) internal {
require(!exists(_tokenId), "Error: Tried to mint duplicate token id");
_updateTokenBalance(_to, _tokenId, 1, ObjectLib.Operations.REPLACE);
tokenOwner[_tokenId] = _to;
tokenType[_tokenId] = NFT;
allTokens.push(_tokenId);
emit Transfer(address(this), _to, _tokenId);
}
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