Contract Source Code:
File 1 of 1 : ThetaToken
pragma solidity ^0.4.18;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
function mul(uint a, uint b) internal pure returns (uint) {
if (a == 0) {
return 0;
}
uint c = a * b;
assert(c / a == b);
return c;
}
function div(uint a, uint b) internal pure returns (uint) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
function sub(uint a, uint b) internal pure returns (uint) {
assert(b <= a);
return a - b;
}
function add(uint a, uint b) internal pure returns (uint) {
uint c = a + b;
assert(c >= a);
return c;
}
}
contract ERC20 {
function totalSupply() public constant returns (uint supply);
function balanceOf(address _owner) public constant returns (uint balance);
function transfer(address _to, uint _value) public returns (bool success);
function transferFrom(address _from, address _to, uint _value) public returns (bool success);
function approve(address _spender, uint _value) public returns (bool success);
function allowance(address _owner, address _spender) public constant returns (uint remaining);
event Transfer(address indexed _from, address indexed _to, uint _value);
event Approval(address indexed _owner, address indexed _spender, uint _value);
}
contract StandardToken is ERC20 {
using SafeMath for uint;
uint public totalSupply;
mapping (address => uint) balances;
mapping (address => mapping (address => uint)) allowed;
function totalSupply() public constant returns (uint) {
return totalSupply;
}
function balanceOf(address _owner) public constant returns (uint balance) {
return balances[_owner];
}
function transfer(address _to, uint _value) public returns (bool success) {
require(balances[msg.sender] >= _value && _value > 0);
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
Transfer(msg.sender, _to, _value);
return true;
}
function transferFrom(address _from, address _to, uint _value) public returns (bool success) {
require(balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0);
balances[_from] = balances[_from].sub(_value);
balances[_to] = balances[_to].add(_value);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
Transfer(_from, _to, _value);
return true;
}
function approve(address _spender, uint _value) public returns (bool success) {
// https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
if ((_value != 0) && (allowed[msg.sender][_spender] != 0)) {
revert();
}
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
function allowance(address _owner, address _spender) public constant returns (uint remaining) {
return allowed[_owner][_spender];
}
}
contract Controlled {
address public controller;
function Controlled() public {
controller = msg.sender;
}
function changeController(address _newController) public only_controller {
controller = _newController;
}
function getController() constant public returns (address) {
return controller;
}
modifier only_controller {
require(msg.sender == controller);
_;
}
}
contract ThetaToken is StandardToken, Controlled {
using SafeMath for uint;
string public constant name = "Theta Token";
string public constant symbol = "THETA";
uint8 public constant decimals = 18;
// tokens can be transferred amoung holders only after unlockTime
uint unlockTime;
// for token circulation on platforms that integrate Theta before unlockTime
mapping (address => bool) internal precirculated;
function ThetaToken(uint _unlockTime) public {
unlockTime = _unlockTime;
}
function transfer(address _to, uint _amount) can_transfer(msg.sender, _to) public returns (bool success) {
return super.transfer(_to, _amount);
}
function transferFrom(address _from, address _to, uint _amount) can_transfer(_from, _to) public returns (bool success) {
return super.transferFrom(_from, _to, _amount);
}
function mint(address _owner, uint _amount) external only_controller returns (bool) {
totalSupply = totalSupply.add(_amount);
balances[_owner] = balances[_owner].add(_amount);
Transfer(0, _owner, _amount);
return true;
}
function allowPrecirculation(address _addr) only_controller public {
precirculated[_addr] = true;
}
function disallowPrecirculation(address _addr) only_controller public {
precirculated[_addr] = false;
}
function isPrecirculationAllowed(address _addr) constant public returns(bool) {
return precirculated[_addr];
}
function changeUnlockTime(uint _unlockTime) only_controller public {
unlockTime = _unlockTime;
}
function getUnlockTime() constant public returns (uint) {
return unlockTime;
}
modifier can_transfer(address _from, address _to) {
require((block.number >= unlockTime) || (isPrecirculationAllowed(_from) && isPrecirculationAllowed(_to)));
_;
}
}