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// spell.sol - An un-owned object that performs one action one time only
// Copyright (C) 2017, 2018 DappHub, LLC
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <>.
pragma solidity >=0.4.23;
import "ds-exec/exec.sol";
import "ds-note/note.sol";
contract DSSpell is DSExec, DSNote {
address public whom;
uint256 public mana;
bytes public data;
bool public done;
constructor(address whom_, uint256 mana_, bytes memory data_) public {
whom = whom_;
mana = mana_;
data = data_;
// Only marked 'done' if CALL succeeds (not exceptional condition).
function cast() public note {
require(!done, "ds-spell-already-cast");
exec(whom, data, mana);
done = true;
contract DSSpellBook {
function make(address whom, uint256 mana, bytes memory data) public returns (DSSpell) {
return new DSSpell(whom, mana, data);
You can’t perform that action at this time.