// Based on https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/token/StandardToken.sol .
//
// An example ERC20 token, used for testing.
pragma solidity ^0.4.8;
import '../deps/ERC20TokenInterface.sol';
import './deps/SafeMath.sol';
/**
* Standard ERC20 token
*
* https://github.com/ethereum/EIPs/issues/20
* Based on code by FirstBlood:
* https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
*/
contract ExampleToken is ERC20TokenInterface, SafeMath {
mapping(address => uint256) balances;
mapping(address => mapping (address => uint256)) allowed;
function ExampleToken(address[] accounts) {
for (uint16 i = 0; i < accounts.length; ++i) {
balances[accounts[i]] = 100000000000000000000; // 1e20
}
}
// This is a method used only for tests.
function injectTokens(address to, uint256 howMuch) external {
balances[to] = balances[to] + howMuch;
}
// See ERC20
function transfer(address _to, uint256 _value) external returns (bool) {
Eif (balances[msg.sender] >= _value && _value > 0) {
balances[msg.sender] -= _value;
balances[_to] += _value;
Transfer(msg.sender, _to, _value);
return true;
}
return false;
}
// See ERC20
function transferFrom(address _from, address _to, uint256 _value) external returns (bool) {
Eif (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
balances[_to] += _value;
balances[_from] -= _value;
allowed[_from][msg.sender] -= _value;
Transfer(_from, _to, _value);
return true;
}
return false;
}
// See ERC20
function balanceOf(address _owner) constant external returns (uint256) {
return balances[_owner];
}
// See ERC20
function approve(address _spender, uint256 _value) external returns (bool) {
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
// See ERC20
function allowance(address _owner, address _spender) constant external returns (uint256) {
return allowed[_owner][_spender];
}
}
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