YOYOW Token
ERC20
This contract is an ERC20 token.
Name
YOYOW Token
Symbol
YOYOW
Decimals
18
Total Supply
2,000,000,000 YOYOW
About
Stats
Public Functions
19
Event Types
5
Code Size
29,304 bytes
Events (5) keyboard_arrow_up
State Variables (16) keyboard_arrow_up
Functions
changeController keyboard_arrow_up
Modifiers help
onlyController checks for the following:
Source Code
function changeController(address _newController) onlyController {
controller = _newController;
}
changeGenerator keyboard_arrow_up
Modifiers help
onlyGenerator checks for the following:
Source Code
function changeGenerator(address _newGenerator) onlyGenerator {
generator = _newGenerator;
}
transfer keyboard_arrow_up
Requirements help
Source Code
function transfer(address _to, uint256 _amount) returns (bool success) {
if (!transfersEnabled) throw;
return doTransfer(msg.sender, _to, _amount);
}
transferFrom keyboard_arrow_up
Requirements help
Source Code
function transferFrom(
address _from,
address _to,
uint256 _amount
) returns (bool success) {
// The controller of this contract can move tokens around at will,
// this is important to recognize! Confirm that you trust the
// controller of this contract, which in most situations should be
// another open source smart contract or 0x0
if (msg.sender != controller) {
if (!transfersEnabled) throw;
// The standard ERC 20 transferFrom functionality
if (allowed[_from][msg.sender] < _amount) return false;
allowed[_from][msg.sender] -= _amount;
}
return doTransfer(_from, _to, _amount);
}
balanceOf keyboard_arrow_up
approve keyboard_arrow_up
Requirements help
One or more of the following:
Source Code
function approve(address _spender, uint256 _amount) returns (bool success) {
if (!transfersEnabled) throw;
// To change the approve amount you first have to reduce the addresses`
// allowance to zero by calling `approve(_spender,0)` if it is not
// already 0 to mitigate the race condition described here:
// https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
if ((_amount != 0) && (allowed[msg.sender][_spender] != 0)) throw;
// Alerts the token controller of the approve function call
if (isContract(controller)) {
if (!TokenController(controller).onApprove(msg.sender, _spender, _amount))
throw;
}
allowed[msg.sender][_spender] = _amount;
Approval(msg.sender, _spender, _amount);
return true;
}
allowance keyboard_arrow_up
approveAndCall keyboard_arrow_up
Source Code
function approveAndCall(
address _spender,
uint256 _amount,
bytes _extraData
) returns (bool success) {
if (!approve(_spender, _amount)) throw;
ApproveAndCallFallBack(_spender).receiveApproval(
msg.sender,
_amount,
this,
_extraData
);
return true;
}
totalSupply keyboard_arrow_up
balanceOfAt keyboard_arrow_up
Source Code
function balanceOfAt(address _owner, uint256 _blockNumber)
constant
returns (uint256)
{
// These next few lines are used when the balance of the token is
// requested before a check point was ever created for this token, it
// requires that the `parentToken.balanceOfAt` be queried at the
// genesis block for that token as this contains initial balance of
// this token
if (
(balances[_owner].length == 0) ||
(balances[_owner][0].fromBlock > _blockNumber)
) {
if (address(parentToken) != 0) {
return
parentToken.balanceOfAt(_owner, min(_blockNumber, parentSnapShotBlock));
} else {
// Has no parent
return 0;
}
// This will return the expected balance during normal situations
} else {
return getValueAt(balances[_owner], _blockNumber);
}
}
totalSupplyAt keyboard_arrow_up
Source Code
function totalSupplyAt(uint256 _blockNumber) constant returns (uint256) {
// These next few lines are used when the totalSupply of the token is
// requested before a check point was ever created for this token, it
// requires that the `parentToken.totalSupplyAt` be queried at the
// genesis block for this token as that contains totalSupply of this
// token at this block number.
if (
(totalSupplyHistory.length == 0) ||
(totalSupplyHistory[0].fromBlock > _blockNumber)
) {
if (address(parentToken) != 0) {
return parentToken.totalSupplyAt(min(_blockNumber, parentSnapShotBlock));
} else {
return 0;
}
// This will return the expected totalSupply during normal situations
} else {
return getValueAt(totalSupplyHistory, _blockNumber);
}
}
createCloneToken keyboard_arrow_up
Parameters help
Source Code
function createCloneToken(
string _cloneTokenName,
uint8 _cloneDecimalUnits,
string _cloneTokenSymbol,
uint256 _snapshotBlock,
bool _transfersEnabled
) returns (address) {
if (_snapshotBlock == 0) _snapshotBlock = getBlockNumber();
MiniMeToken cloneToken = tokenFactory.createCloneToken(
this,
_snapshotBlock,
_cloneTokenName,
_cloneDecimalUnits,
_cloneTokenSymbol,
_transfersEnabled
);
cloneToken.changeController(msg.sender);
// An event to make the token easy to find on the blockchain
NewCloneToken(address(cloneToken), _snapshotBlock);
return address(cloneToken);
}
generateTokens keyboard_arrow_up
Modifiers help
onlyGenerator checks for the following:
Requirements help
Source Code
function generateTokens(address _owner, uint256 _amount)
onlyGenerator
returns (bool)
{
uint256 curTotalSupply = getValueAt(totalSupplyHistory, getBlockNumber());
if (curTotalSupply + _amount < curTotalSupply) throw; // Check for overflow
updateValueAtNow(totalSupplyHistory, curTotalSupply + _amount);
var previousBalanceTo = balanceOf(_owner);
if (previousBalanceTo + _amount < previousBalanceTo) throw; // Check for overflow
updateValueAtNow(balances[_owner], previousBalanceTo + _amount);
Transfer(0, _owner, _amount);
return true;
}
destroyTokens keyboard_arrow_up
Modifiers help
onlyController checks for the following:
Requirements help
Source Code
function destroyTokens(address _owner, uint256 _amount)
onlyController
returns (bool)
{
uint256 curTotalSupply = getValueAt(totalSupplyHistory, getBlockNumber());
if (curTotalSupply < _amount) throw;
updateValueAtNow(totalSupplyHistory, curTotalSupply - _amount);
var previousBalanceFrom = balanceOf(_owner);
if (previousBalanceFrom < _amount) throw;
updateValueAtNow(balances[_owner], previousBalanceFrom - _amount);
Transfer(_owner, 0, _amount);
return true;
}
register keyboard_arrow_up
enableTransfers keyboard_arrow_up
Modifiers help
onlyController checks for the following:
Source Code
function enableTransfers(bool _transfersEnabled) onlyController {
transfersEnabled = _transfersEnabled;
}
enableShowValue keyboard_arrow_up
Modifiers help
onlyController checks for the following:
Source Code
function enableShowValue(bool _showValue) onlyController {
showValue = _showValue;
}
constructor keyboard_arrow_up
claimTokens keyboard_arrow_up
Modifiers help
onlyController checks for the following:
Source Code
function claimTokens(address _token) onlyController {
if (_token == 0x0) {
controller.transfer(this.balance);
return;
}
ERC20Token token = ERC20Token(_token);
uint256 balance = token.balanceOf(this);
token.transfer(controller, balance);
ClaimedTokens(_token, controller, balance);
}
Internal Functions
Internal functions are parts of the contract that can't be used directly, but instead are used by the public functions listed above.
internal MiniMeToken.doTransfer keyboard_arrow_up
Requirements help
Source Code
function doTransfer(
address _from,
address _to,
uint256 _amount
) internal returns (bool) {
if (_amount == 0) {
return true;
}
if (parentSnapShotBlock >= getBlockNumber()) throw;
// Do not allow transfer to 0x0 or the token contract itself
if ((_to == 0) || (_to == address(this))) throw;
// If the amount being transfered is more than the balance of the
// account the transfer returns false
var previousBalanceFrom = balanceOfAt(_from, getBlockNumber());
if (previousBalanceFrom < _amount) {
return false;
}
// Alerts the token controller of the transfer
if (isContract(controller)) {
if (!TokenController(controller).onTransfer(_from, _to, _amount)) throw;
}
// First update the balance array with the new value for the address
// sending the tokens
updateValueAtNow(balances[_from], previousBalanceFrom - _amount);
// Then update the balance array with the new value for the address
// receiving the tokens
var previousBalanceTo = balanceOfAt(_to, getBlockNumber());
if (previousBalanceTo + _amount < previousBalanceTo) throw; // Check for overflow
updateValueAtNow(balances[_to], previousBalanceTo + _amount);
// An event to make the transfer easy to find on the blockchain
Transfer(_from, _to, _amount);
return true;
}
internal MiniMeToken.getValueAt keyboard_arrow_up
Source Code
function getValueAt(Checkpoint[] storage checkpoints, uint256 _block)
internal
constant
returns (uint256)
{
if (checkpoints.length == 0) return 0;
// Shortcut for the actual value
if (_block >= checkpoints[checkpoints.length - 1].fromBlock)
return checkpoints[checkpoints.length - 1].value;
if (_block < checkpoints[0].fromBlock) return 0;
// Binary search of the value in the array
uint256 min = 0;
uint256 max = checkpoints.length - 1;
while (max > min) {
uint256 mid = (max + min + 1) / 2;
if (checkpoints[mid].fromBlock <= _block) {
min = mid;
} else {
max = mid - 1;
}
}
return checkpoints[min].value;
}
internal MiniMeToken.updateValueAtNow keyboard_arrow_up
Source Code
function updateValueAtNow(Checkpoint[] storage checkpoints, uint256 _value)
internal
{
if (
(checkpoints.length == 0) ||
(checkpoints[checkpoints.length - 1].fromBlock < getBlockNumber())
) {
Checkpoint newCheckPoint = checkpoints[checkpoints.length++];
newCheckPoint.fromBlock = uint128(getBlockNumber());
newCheckPoint.value = uint128(_value);
} else {
Checkpoint oldCheckPoint = checkpoints[checkpoints.length - 1];
oldCheckPoint.value = uint128(_value);
}
}