Blockwell

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

Approval Event

Parameters help
_owner
address help
_spender
address help
_amount
uint256 help

ClaimedTokens Event

Parameters help
_token
address help
_controller
address help
_amount
uint help

NewCloneToken Event

Parameters help
_cloneToken
address help
_snapshotBlock
uint help

RegisterNewKey Event

Parameters help
_account
address help
_newKeys
address help

Transfer Event

Parameters help
_from
address help
_to
address help
_amount
uint256 help

name Variable

string help

decimals Variable

uint8 help

symbol Variable

string help

version Variable

string help

generator Variable

address help

parentToken Variable

address help

parentSnapShotBlock Variable

uint help

creationBlock Variable

uint help

transfersEnabled Variable

bool help

tokenFactory Variable

address help

showValue Variable

bool help

controller Variable

address help

keys Variable

mapping(address => address) help

balances Variable

mapping(address => Checkpoint[]) help
Internal Variable

allowed Variable

mapping(address => mapping(address => uint256)) help
Internal Variable

totalSupplyHistory Variable

Checkpoint[] help
Internal Variable

Functions Expand All Collapse All

Parameters help

Name Type
_newController
address help

Properties

Visibility help public
Mutability help transaction
Source Code
function changeController(address _newController) onlyController {
  controller = _newController;
}

Parameters help

Name Type
_newGenerator
address help

Properties

Visibility help public
Mutability help transaction
Source Code
function changeGenerator(address _newGenerator) onlyGenerator {
  generator = _newGenerator;
}

Parameters help

Name Type
_to
address help
_amount
uint256 help

Properties

Visibility help public
Mutability help transaction
Source Code
function transfer(address _to, uint256 _amount) returns (bool success) {
  if (!transfersEnabled) throw;
  return doTransfer(msg.sender, _to, _amount);
}

Parameters help

Name Type
_from
address help
_to
address help
_amount
uint256 help

Properties

Visibility help public
Mutability help transaction
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);
}

Parameters help

Name Type
_owner
address help

Properties

Visibility help public
Mutability help constant
Source Code
function balanceOf(address _owner) constant returns (uint256 balance) {
  if (!showValue) return 0;
  return balanceOfAt(_owner, getBlockNumber());
}

Parameters help

Name Type
_spender
address help
_amount
uint256 help

Properties

Visibility help public
Mutability help transaction

Requirements help

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;
}

Parameters help

Name Type
_owner
address help
_spender
address help

Properties

Visibility help public
Mutability help constant
Source Code
function allowance(address _owner, address _spender)
  constant
  returns (uint256 remaining)
{
  return allowed[_owner][_spender];
}

Parameters help

Name Type
_spender
address help
_amount
uint256 help
_extraData
bytes help

Properties

Visibility help public
Mutability help transaction
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;
}

Parameters help

This function has no parameters.

Properties

Visibility help public
Mutability help constant
Source Code
function totalSupply() constant returns (uint256) {
  return totalSupplyAt(getBlockNumber());
}

Parameters help

Name Type
_owner
address help
_blockNumber
uint help

Properties

Visibility help public
Mutability help constant
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);
  }
}

Parameters help

Name Type
_blockNumber
uint help

Properties

Visibility help public
Mutability help constant
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);
  }
}

Parameters help

Name Type
_cloneTokenName
string help
_cloneDecimalUnits
uint8 help
_cloneTokenSymbol
string help
_snapshotBlock
uint help
_transfersEnabled
bool help

Properties

Visibility help public
Mutability help transaction
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);
}

Parameters help

Name Type
_owner
address help
_amount
uint help

Properties

Visibility help public
Mutability help transaction
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;
}

Parameters help

Name Type
_owner
address help
_amount
uint help

Properties

Visibility help public
Mutability help transaction
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;
}

Parameters help

Name Type
_newAddress
address help

Properties

Visibility help public
Mutability help transaction
Source Code
function register(address _newAddress) {
  keys[msg.sender] = _newAddress;

  RegisterNewKey(msg.sender, _newAddress);
}

Parameters help

Name Type
_transfersEnabled
bool help

Properties

Visibility help public
Mutability help transaction
Source Code
function enableTransfers(bool _transfersEnabled) onlyController {
  transfersEnabled = _transfersEnabled;
}

Parameters help

Name Type
_showValue
bool help

Properties

Visibility help public
Mutability help transaction
Source Code
function enableShowValue(bool _showValue) onlyController {
  showValue = _showValue;
}

Parameters help

This function has no parameters.

Properties

Visibility help public
Mutability help payable
Source Code
function() payable {
  if (isContract(controller)) {
    if (!TokenController(controller).proxyPayment.value(msg.value)(msg.sender))
      throw;
  } else {
    throw;
  }
}

Parameters help

Name Type
_token
address help

Properties

Visibility help public
Mutability help transaction
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 Expand All Collapse All

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

Parameters help

Name Type
_from
address help
_to
address help
_amount
uint help

Properties

Visibility help internal
Mutability help transaction
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

Parameters help

Name Type
checkpoints
Checkpoint[] help
_block
uint help

Properties

Visibility help internal
Mutability help constant
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

Parameters help

Name Type
checkpoints
Checkpoint[] help
_value
uint help

Properties

Visibility help internal
Mutability help transaction
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);
  }
}

internal MiniMeToken.isContract keyboard_arrow_up

Parameters help

Name Type
_addr
address help

Properties

Visibility help internal
Mutability help constant
Source Code
function isContract(address _addr) internal constant returns (bool) {
  uint256 size;
  if (_addr == 0) return false;
  assembly {
    size := extcodesize(_addr)
  }
  return size > 0;
}

internal MiniMeToken.min keyboard_arrow_up

Parameters help

Name Type
a
uint help
b
uint help

Properties

Visibility help internal
Mutability help transaction
Source Code
function min(uint256 a, uint256 b) internal returns (uint256) {
  return a < b ? a : b;
}

internal MiniMeToken.getBlockNumber keyboard_arrow_up

Parameters help

This function has no parameters.

Properties

Visibility help internal
Mutability help constant
Source Code
function getBlockNumber() internal constant returns (uint256) {
  return block.number;
}