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2354036 Feb 7, 2017
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pragma solidity ^0.4.4;
import "../SafeMathLib.sol";
library ERC20Lib {
using SafeMathLib for uint;
struct TokenStorage {
mapping (address => uint) balances;
mapping (address => mapping (address => uint)) allowed;
uint totalSupply;
event Transfer(address indexed from, address indexed to, uint value);
event Approval(address indexed owner, address indexed spender, uint value);
function init(TokenStorage storage self, uint _initial_supply) {
self.totalSupply = _initial_supply;
self.balances[msg.sender] = _initial_supply;
function transfer(TokenStorage storage self, address _to, uint _value) returns (bool success) {
self.balances[msg.sender] = self.balances[msg.sender].minus(_value);
self.balances[_to] = self.balances[_to].plus(_value);
Transfer(msg.sender, _to, _value);
return true;
function transferFrom(TokenStorage storage self, address _from, address _to, uint _value) returns (bool success) {
var _allowance = self.allowed[_from][msg.sender];
self.balances[_to] = self.balances[_to].plus(_value);
self.balances[_from] = self.balances[_from].minus(_value);
self.allowed[_from][msg.sender] = _allowance.minus(_value);
Transfer(_from, _to, _value);
return true;
function balanceOf(TokenStorage storage self, address _owner) constant returns (uint balance) {
return self.balances[_owner];
function approve(TokenStorage storage self, address _spender, uint _value) returns (bool success) {
self.allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
function allowance(TokenStorage storage self, address _owner, address _spender) constant returns (uint remaining) {
return self.allowed[_owner][_spender];