56 lines
2.2 KiB
Solidity
56 lines
2.2 KiB
Solidity
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/*
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You should inherit from StandardToken or, for a token like you would want to
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deploy in something like Mist, see HumanStandardToken.sol.
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(This implements ONLY the standard functions and NOTHING else.
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If you deploy this, you won't have anything useful.)
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Implements ERC 20 Token standard: https://github.com/ethereum/EIPs/issues/20
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.*/
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import "Token.sol";
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contract StandardToken is Token {
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function transfer(address _to, uint256 _value) returns (bool success) {
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//Default assumes totalSupply can't be over max (2^256 - 1).
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//If your token leaves out totalSupply and can issue more tokens as time goes on, you need to check if it doesn't wrap.
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//Replace the if with this one instead.
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//if (balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
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if (balances[msg.sender] >= _value && _value > 0) {
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balances[msg.sender] -= _value;
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balances[_to] += _value;
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Transfer(msg.sender, _to, _value);
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return true;
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} else { return false; }
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}
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function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
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//same as above. Replace this line with the following if you want to protect against wrapping uints.
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//if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
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if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
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balances[_to] += _value;
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balances[_from] -= _value;
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allowed[_from][msg.sender] -= _value;
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Transfer(_from, _to, _value);
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return true;
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} else { return false; }
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}
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function balanceOf(address _owner) constant returns (uint256 balance) {
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return balances[_owner];
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}
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function approve(address _spender, uint256 _value) returns (bool success) {
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allowed[msg.sender][_spender] = _value;
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Approval(msg.sender, _spender, _value);
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return true;
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}
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function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
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return allowed[_owner][_spender];
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}
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mapping (address => uint256) balances;
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mapping (address => mapping (address => uint256)) allowed;
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}
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