git ssb

1
pragma solidity ^0.4.4;
2
3
/*
4
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.
5
6
In other words. This is intended for deployment in something like a Token Factory or Mist wallet, and then used by humans.
7
Imagine coins, currencies, shares, voting weight, etc.
8
Machine-based, rapid creation of many tokens would not necessarily need these extra features or will be minted in other manners.
9
10
1) Initial Finite Supply (upon creation one specifies how much is minted).
11
2) In the absence of a token registry: Optional Decimal, Symbol & Name.
12
3) Optional approveAndCall() functionality to notify a contract if an approval() has occurred.
13
14
.*/
15
16
import "./StandardToken.sol";
17
18
contract EntropyToken is StandardToken {
19
  /* Public variables of the token */
20
  string public name;
21
  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.
22
  string public symbol;        // identifier
23
  string public version;       // human 0.1 standard. Just an arbitrary versioning scheme.
24
  uint   public totalValue;    // Total value in wei
25
  uint   public safety_limit;  // Maximum safe amount of ether to hold
26
27
  /* Approves and then calls the receiving contract */
28
  function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) {
29
    allowed[msg.sender][_spender] = _value;
30
    Approval(msg.sender, _spender, _value);
31
32
    //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.
33
    //receiveApproval(address _from, uint256 _value, address _tokenContract, bytes _extraData)
34
    //it is assumed that when does this that the call *should* succeed, otherwise one would use vanilla approve instead.
35
    if(!_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData)) { throw; }
36
    return true;
37
    }
38
}
39