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rasper
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pragma solidity ^0.4.16; | |
contract tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData); } | |
contract Rasper { | |
/* Public variables of the RASPER token */ | |
string public standard = 'RASPER 1.1'; | |
string public name = 'Rasper'; | |
string public symbol = 'RSPR'; | |
uint8 public decimals = 16; | |
uint256 public totalSupply = 1000000000000000000000000; | |
/* Creates an array with all balances */ | |
mapping (address => uint256) public balanceOf; | |
mapping (address => mapping (address => uint256)) public allowance; | |
/* Generates a public event on the blockchain that will notify clients */ | |
event Transfer(address indexed from, address indexed to, uint256 value); | |
/* Notifies clients about the amount burnt */ | |
event Burn(address indexed from, uint256 value); | |
/* Initializes contract with initial supply tokens to me */ | |
function Rasper() { | |
balanceOf[msg.sender] = totalSupply; // Give the creator all initial tokens | |
} | |
/* Send coins */ | |
function transfer(address _to, uint256 _value) { | |
if (_to == 0x0) revert(); // Prevent transfer to 0x0 address. Use burn() instead | |
if (balanceOf[msg.sender] < _value) revert(); // Check if the sender has enough | |
if (balanceOf[_to] + _value < balanceOf[_to]) revert(); // Check for overflows | |
balanceOf[msg.sender] -= _value; // Subtract from the sender | |
balanceOf[_to] += _value; // Add the same to the recipient | |
Transfer(msg.sender, _to, _value); // Notify anyone listening that this transfer took place | |
} | |
/* Allow another contract to spend some tokens on my behalf */ | |
function approve(address _spender, uint256 _value) | |
returns (bool success) { | |
if ((_value != 0) && (allowance[msg.sender][_spender] != 0)) revert(); | |
allowance[msg.sender][_spender] = _value; | |
return true; | |
} | |
/* Approve and then communicate the approved contract in a single tx */ | |
function approveAndCall(address _spender, uint256 _value, bytes _extraData) | |
returns (bool success) { | |
tokenRecipient spender = tokenRecipient(_spender); | |
if (approve(_spender, _value)) { | |
spender.receiveApproval(msg.sender, _value, this, _extraData); | |
return true; | |
} | |
} | |
/* A contract attempts to get the coins */ | |
function transferFrom(address _from, address _to, uint256 _value) returns (bool success) { | |
if (_to == 0x0) revert(); // Prevent transfer to 0x0 address. Use burn() instead | |
if (balanceOf[_from] < _value) revert(); // Check if the sender has enough | |
if (balanceOf[_to] + _value < balanceOf[_to]) revert(); // Check for overflows | |
if (_value > allowance[_from][msg.sender]) revert(); // Check allowance | |
balanceOf[_from] -= _value; // Subtract from the sender | |
balanceOf[_to] += _value; // Add the same to the recipient | |
allowance[_from][msg.sender] -= _value; | |
Transfer(_from, _to, _value); | |
return true; | |
} | |
/* Burn RSPRs by User */ | |
function burn(uint256 _value) returns (bool success) { | |
if (balanceOf[msg.sender] < _value) revert(); // Check if the sender has enough | |
balanceOf[msg.sender] -= _value; // Subtract from the sender | |
totalSupply -= _value; // Updates totalSupply | |
Burn(msg.sender, _value); | |
return true; | |
} | |
/* Burn RSPRs from Users */ | |
function burnFrom(address _from, uint256 _value) returns (bool success) { | |
if (balanceOf[_from] < _value) revert(); // Check if the sender has enough | |
if (_value > allowance[_from][msg.sender]) revert(); // Check allowance | |
balanceOf[_from] -= _value; // Subtract from the sender | |
totalSupply -= _value; // Updates totalSupply | |
Burn(_from, _value); | |
return true; | |
} | |
} |
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