ERC888-imporvement

ERC888

contract MultidimensionalToken {

    string public name;
    string public symbol;
    
    mapping (uint256 => string) internal tokenNames;
    mapping (uint256 => string) internal tokenSymbols;
    mapping (uint256 => uint8) internal tokenDecimals;
    mapping (uint256 => mapping (address => uint)) internal balances;
    
    event Transfer(uint256 indexed _id, address indexed _from, address indexed _to, uint256 _value);
    
    function name(uint256 _id) public view returns (string) {
        return tokenNames[_id];
    }
    
    function symbol(uint256 _id) public view returns (string) {
        return abi.encode(symbol, "-", tokenSymbols[_id]);
    }
    
    function decimals(uint256 _id) public view returns (uint8) {
        return tokenDecimals[_id];
    }
    
    function balanceOf(uint256 _id, address _owner) public view returns (uint256 balance) {
        return balances[_id][_owner];
    }

    function transfer(uint256 _id, address _to, uint256 _value) public returns (bool success) {
        require(balances[msg.sender][_id] >= _value);
        require(balances[_to][_id] + _value >= _value);

        balances[msg.sender][_id] -= _value;
        balances[_to][_id] += _value;
        Transfer(_id, msg.sender, _to, _value);
        return true;
    }
}