SmartContract/ERC20.sol at develop · GX-Coin/SmartContract · GitHub

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pragma solidity ^0.4.2;

// Token standard API
// https://github.com/ethereum/EIPs/issues/20

contract ERC20Constant {
    function totalSupply() constant returns (uint supply);
    function balanceOf( address who ) constant returns (uint value);
    function allowance(address owner, address spender) constant returns (uint _allowance);
}

contract ERC20Stateful {
    function transfer( address to, uint value) returns (bool ok);
    function transferFrom( address from, address to, uint value) returns (bool ok);
    function approve(address spender, uint value) returns (bool ok);
}

contract ERC20Events {
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval( address indexed owner, address indexed spender, uint value);
}

contract ERC20 is ERC20Constant, ERC20Stateful, ERC20Events {}