61 lines
3.1 KiB
Solidity
61 lines
3.1 KiB
Solidity
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/*
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This Token Contract implements the standard token functionality (https://github.com/ethereum/EIPs/issues/20) as well as the following OPTIONAL extras intended for use by humans.
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In other words. This is intended for deployment in something like a Token Factory or Mist wallet, and then used by humans.
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Imagine coins, currencies, shares, voting weight, etc.
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Machine-based, rapid creation of many tokens would not necessarily need these extra features or will be minted in other manners.
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1) Initial Finite Supply (upon creation one specifies how much is minted).
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2) In the absence of a token registry: Optional Decimal, Symbol & Name.
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3) Optional approveAndCall() functionality to notify a contract if an approval() has occurred.
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.*/
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import "StandardToken.sol";
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contract HumanStandardToken is StandardToken {
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function () {
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//if ether is sent to this address, send it back.
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throw;
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}
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/* Public variables of the token */
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/*
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NOTE:
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The following variables are OPTIONAL vanities. One does not have to include them.
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They allow one to customise the token contract & in no way influences the core functionality.
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Some wallets/interfaces might not even bother to look at this information.
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*/
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string public name; //fancy name: eg Simon Bucks
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uint8 public decimals; //How many decimals to show. ie. There could 1000 base units with 3 decimals. Meaning 0.980 SBX = 980 base units. It's like comparing 1 wei to 1 ether.
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string public symbol; //An identifier: eg SBX
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string public version = 'H0.1'; //human 0.1 standard. Just an arbitrary versioning scheme.
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function HumanStandardToken(
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uint256 _initialAmount,
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string _tokenName,
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uint8 _decimalUnits,
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string _tokenSymbol
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) {
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balances[msg.sender] = _initialAmount; // Give the creator all initial tokens
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totalSupply = _initialAmount; // Update total supply
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name = _tokenName; // Set the name for display purposes
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decimals = _decimalUnits; // Amount of decimals for display purposes
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symbol = _tokenSymbol; // Set the symbol for display purposes
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}
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/* Approves and then calls the receiving contract */
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function approveAndCall(address _spender, uint256 _value, bytes _extraData) 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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//call the receiveApproval function on the contract you want to be notified. This crafts the function signature manually so one doesn't have to include a contract in here just for this.
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//receiveApproval(address _from, uint256 _value, address _tokenContract, bytes _extraData)
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//it is assumed that when does this that the call *should* succeed, otherwise one would use vanilla approve instead.
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if(!_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData)) { throw; }
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return true;
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}
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}
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