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pragma solidity 0.4.18;
import "../Token/Token.sol";
contract ERC20Token is Token {
function transfer(address _to, uint _value)
public
returns (bool)
{
require(balances[msg.sender] >= _value && balances[_to] + _value >= balances[_to]);
balances[msg.sender] -= _value;
balances[_to] += _value;
Transfer(msg.sender, _to, _value);
return true;
}
function transferFrom(address _from, address _to, uint _value)
public
returns (bool)
{
require(balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value >= balances[_to]);
balances[_to] += _value;
balances[_from] -= _value;
allowed[_from][msg.sender] -= _value;
Transfer(_from, _to, _value);
return true;
}
function approve(address _spender, uint _value)
public
returns (bool)
{
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
function balanceOf(address _owner)
public
view
returns (uint)
{
return balances[_owner];
}
function allowance(address _owner, address _spender)
public
view
returns (uint)
{
return allowed[_owner][_spender];
}
mapping (address => uint) balances;
mapping (address => mapping (address => uint)) allowed;
uint public totalSupply;
}
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