pragma solidity ^ 0.4.24;
contract VTM {
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
contract BaseContract is VTM {
using SafeMath
for * ;
string public name;
string public symbol;
uint8 public decimals;
uint256 public totalSupply;
mapping(address => uint256) public balanceOf;
mapping(address => mapping(address => uint256)) public allowance;
mapping(address => address[]) public affs;
mapping(address => address) public aff;
function BaseContract(
uint256 _totalSupply,
string _name,
uint8 _decimal,
string _symbol
) {
totalSupply = _totalSupply;
name = _name;
symbol = _symbol;
decimals = _decimal;
balanceOf[msg.sender] = _totalSupply;
aff[msg.sender] = msg.sender;
}
function transfer(address _to, uint256 _value) public returns(bool success) {
require(_to != 0x0, "invalid addr");
balanceOf[msg.sender] = balanceOf[msg.sender].sub(_value);
balanceOf[_to] = balanceOf[_to].add(_value);
emit Transfer(msg.sender, _to, _value);
if(_value > 0 && aff[_to] == address(0) && msg.sender != _to) {
aff[_to] = msg.sender;
affs[msg.sender].push(_to);
}
return true;
}
function approve(address _spender, uint256 _value) public returns(bool success) {
require(_spender != 0x0, "invalid addr");
require(_value > 0, "invalid value");
allowance[msg.sender][_spender] = _value;
return true;
}
function transferFrom(address _from, address _to, uint256 _value) public returns(bool success) {
require(_from != 0x0, "invalid addr");
require(_to != 0x0, "invalid addr");
balanceOf[_from] = balanceOf[_from].sub(_value);
balanceOf[_to] = balanceOf[_to].add(_value);
allowance[_from][msg.sender] = allowance[_from][msg.sender].sub(_value);
emit Transfer(_from, _to, _value);
return true;
}
function getAff(address _addr)
public
view
returns(address) {
return aff[_addr];
}
function getAffLength(address _addr)
public
view
returns(uint256) {
return affs[_addr].length;
}
}
library SafeMath {
function sub(uint256 a, uint256 b)
internal
pure
returns(uint256 c) {
require(b <= a, "sub failed");
c = a - b;
require(c <= a, "sub failed");
return c;
}
function add(uint256 a, uint256 b)
internal
pure
returns(uint256 c) {
c = a + b;
require(c >= a, "add failed");
return c;
}
}
{
"compilationTarget": {
"BaseContract.sol": "BaseContract"
},
"evmVersion": "byzantium",
"libraries": {},
"optimizer": {
"enabled": false,
"runs": 0
},
"remappings": []
}
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