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Add ExampleToken
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std/ExampleToken
Normal file
55
std/ExampleToken
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import "./Token";
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contract ExampleToken is Token {
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uint256 tokenSupply;
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mapping (address => uint256) balances;
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mapping (address =>
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mapping (address => uint256)) approvedTransfers;
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function ExampleToken(address _initialOwner, uint256 _supply) {
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tokenSupply = _supply;
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balances[_initialOwner] = _supply;
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}
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function totalSupply() constant returns (uint256 supply) {
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return tokenSupply;
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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 transfer(address _to, uint256 _value) returns (bool success) {
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if (balances[msg.sender] >= _value) {
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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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}
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else {
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return false;
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}
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}
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function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
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if (approvedTransfers[_from][msg.sender] >= _value) {
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approvedTransfers[_from][msg.sender] -= _value;
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balances[_to] += _value;
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Transfer(_from, _to, _value);
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return true;
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}
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else {
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return false;
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}
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}
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function approve(address _spender, uint256 _value) returns (bool success) {
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approvedTransfers[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 approvedTransfers[_owner][_spender];
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}
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}
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