Created
May 26, 2019 17:29
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pragma solidity ^0.5.0; | |
library SafeMath { | |
function add(uint a, uint b) internal pure returns (uint c) { | |
c = a + b; | |
require(c >= a); | |
} | |
function sub(uint a, uint b) internal pure returns (uint c) { | |
require(b <= a); | |
c = a - b; | |
} | |
function mul(uint a, uint b) internal pure returns (uint c) { | |
c = a * b; | |
require(a == 0 || c / a == b); | |
} | |
function div(uint a, uint b) internal pure returns (uint c) { | |
require(b > 0); | |
c = a / b; | |
} | |
} | |
contract ERC20Interface { | |
function totalSupply() public view returns (uint); | |
function balanceOf(address tokenOwner) public view returns (uint balance); | |
function allowance(address tokenOwner, address spender) public view returns (uint remaining); | |
function transfer(address to, uint tokens) public returns (bool success); | |
function approve(address spender, uint tokens) public returns (bool success); | |
function transferFrom(address from, address to, uint tokens) public returns (bool success); | |
event Transfer(address indexed from, address indexed to, uint tokens); | |
event Approval(address indexed tokenOwner, address indexed spender, uint tokens); | |
} | |
contract ApproveAndCallFallBack { | |
function receiveApproval(address from, uint256 tokens, address token, bytes memory data) public; | |
} | |
contract FixedSupplyToken is ERC20Interface { | |
using SafeMath for uint; | |
string public symbol; | |
string public name; | |
uint8 public decimals; | |
uint _totalSupply; | |
mapping(address => uint) balances; | |
mapping(address => mapping(address => uint)) allowed; | |
constructor(string memory _symbol, string memory _name, uint _supplyOfTokens, address _owner) public { | |
symbol = _symbol; | |
name = _name; | |
decimals = 18; | |
_totalSupply = _supplyOfTokens * 10**uint(decimals); | |
balances[_owner] = _totalSupply; | |
emit Transfer(address(0), _owner, _totalSupply); | |
} | |
function totalSupply() public view returns (uint) { | |
return _totalSupply.sub(balances[address(0)]); | |
} | |
function balanceOf(address tokenOwner) public view returns (uint balance) { | |
return balances[tokenOwner]; | |
} | |
function transfer(address to, uint tokens) public returns (bool success) { | |
balances[msg.sender] = balances[msg.sender].sub(tokens); | |
balances[to] = balances[to].add(tokens); | |
emit Transfer(msg.sender, to, tokens); | |
return true; | |
} | |
function approve(address spender, uint tokens) public returns (bool success) { | |
allowed[msg.sender][spender] = tokens; | |
emit Approval(msg.sender, spender, tokens); | |
return true; | |
} | |
function transferFrom(address from, address to, uint tokens) public returns (bool success) { | |
balances[from] = balances[from].sub(tokens); | |
allowed[from][msg.sender] = allowed[from][msg.sender].sub(tokens); | |
balances[to] = balances[to].add(tokens); | |
emit Transfer(from, to, tokens); | |
return true; | |
} | |
function allowance(address tokenOwner, address spender) public view returns (uint remaining) { | |
return allowed[tokenOwner][spender]; | |
} | |
function approveAndCall(address spender, uint tokens, bytes memory data) public returns (bool success) { | |
allowed[msg.sender][spender] = tokens; | |
emit Approval(msg.sender, spender, tokens); | |
ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, address(this), data); | |
return true; | |
} | |
function () external payable { | |
revert(); | |
} | |
} | |
contract PropertyFactory { | |
event NewToken(address _contract); | |
function createProperty(string memory _symbol, string memory _name, uint _supplyOfTokens, address _owner) public returns (address) { | |
FixedSupplyToken tokenContract = new FixedSupplyToken(_symbol, _name, _supplyOfTokens, _owner); | |
emit NewToken(address(tokenContract)); | |
} | |
} |
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