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ERC-20
Overview
Max Total Supply
173,899.533473697559244416 sSKYRIM
Holders
32
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
3,221.498659817812994327 sSKYRIMValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Similar Match Source Code This contract matches the deployed Bytecode of the Source Code for Contract 0x456DF576...16B8Cb413 The constructor portion of the code might be different and could alter the actual behaviour of the contract
Contract Name:
StakingPool
Compiler Version
v0.6.12+commit.27d51765
Optimization Enabled:
Yes with 200 runs
Other Settings:
constantinople EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.6.12; pragma experimental ABIEncoderV2; import "openzeppelin-solidity/contracts/math/Math.sol"; import "openzeppelin-solidity/contracts/math/SafeMath.sol"; import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol"; import "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol"; import "openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol"; import "openzeppelin-solidity/contracts/utils/ReentrancyGuard.sol"; import "solowei/contracts/AttoDecimal.sol"; import "solowei/contracts/TwoStageOwnable.sol"; contract StakingPool is ERC20, ReentrancyGuard, TwoStageOwnable { using SafeMath for uint256; using SafeERC20 for IERC20; using AttoDecimal for AttoDecimal.Instance; struct Strategy { uint256 endsAt; uint256 perSecondReward; uint256 startsAt; } struct Unstake { uint256 amount; uint256 applicableAt; } uint256 public constant MIN_STAKE_BALANCE = 10**18; uint256 public claimingFeePercent; uint256 public lastUpdatedAt; uint256 private _feePool; uint256 private _lockedRewards; uint256 private _totalStaked; uint256 private _totalUnstaked; uint256 private _unstakingTime; IERC20 private _stakingToken; AttoDecimal.Instance private _defaultPrice; AttoDecimal.Instance private _price; Strategy private _currentStrategy; Strategy private _nextStrategy; mapping(address => Unstake) private _unstakes; function getTimestamp() internal view virtual returns (uint256) { return block.timestamp; } function feePool() public view returns (uint256) { return _feePool; } function lockedRewards() public view returns (uint256) { return _lockedRewards; } function totalStaked() public view returns (uint256) { return _totalStaked; } function totalUnstaked() public view returns (uint256) { return _totalUnstaked; } function stakingToken() public view returns (IERC20) { return _stakingToken; } function unstakingTime() public view returns (uint256) { return _unstakingTime; } function currentStrategy() public view returns (Strategy memory) { return _currentStrategy; } function nextStrategy() public view returns (Strategy memory) { return _nextStrategy; } function getUnstake(address account) public view returns (Unstake memory result) { result = _unstakes[account]; } function defaultPrice() external view returns ( uint256 mantissa, uint256 base, uint256 exponentiation ) { return _defaultPrice.toTuple(); } function getCurrentStrategyUnlockedRewards() public view returns (uint256 unlocked) { unlocked = _getStrategyUnlockedRewards(_currentStrategy); } function getUnlockedRewards() public view returns (uint256 unlocked, bool currentStrategyEnded) { unlocked = _getStrategyUnlockedRewards(_currentStrategy); if (getTimestamp() >= _currentStrategy.endsAt) { currentStrategyEnded = true; if (_nextStrategy.endsAt != 0) unlocked = unlocked.add(_getStrategyUnlockedRewards(_nextStrategy)); } } /// @notice Calculates price of synthetic token for current block function price() public view returns ( uint256 mantissa, uint256 base, uint256 exponentiation ) { (uint256 unlocked, ) = getUnlockedRewards(); uint256 totalStaked_ = _totalStaked; uint256 totalSupply_ = totalSupply(); AttoDecimal.Instance memory result = _defaultPrice; if (totalSupply_ > 0) result = AttoDecimal.div(totalStaked_.add(unlocked), totalSupply_); return result.toTuple(); } /// @notice Returns last updated price of synthetic token function priceStored() public view returns ( uint256 mantissa, uint256 base, uint256 exponentiation ) { return _price.toTuple(); } /// @notice Calculates expected result of swapping synthetic tokens for staking tokens /// @param account Account that wants to swap /// @param amount Minimum amount of staking tokens that should be received at swapping process /// @return unstakedAmount Amount of staking tokens that should be received at swapping process /// @return burnedAmount Amount of synthetic tokens that should be burned at swapping process function calculateUnstake(address account, uint256 amount) public view returns (uint256 unstakedAmount, uint256 burnedAmount) { (uint256 mantissa_, , ) = price(); return _calculateUnstake(account, amount, AttoDecimal.Instance(mantissa_)); } event Claimed( address indexed account, uint256 requestedAmount, uint256 claimedAmount, uint256 feeAmount, uint256 burnedAmount ); event ClaimingFeePercentUpdated(uint256 feePercent); event CurrentStrategyUpdated(uint256 perSecondReward, uint256 startsAt, uint256 endsAt); event FeeClaimed(address indexed receiver, uint256 amount); event NextStrategyUpdated(uint256 perSecondReward, uint256 startsAt, uint256 endsAt); event UnstakingTimeUpdated(uint256 unstakingTime); event NextStrategyRemoved(); event PoolDecreased(uint256 amount); event PoolIncreased(address indexed payer, uint256 amount); event PriceUpdated(uint256 mantissa, uint256 base, uint256 exponentiation); event RewardsUnlocked(uint256 amount); event Staked(address indexed account, address indexed payer, uint256 stakedAmount, uint256 mintedAmount); event Unstaked(address indexed account, uint256 requestedAmount, uint256 unstakedAmount, uint256 burnedAmount); event UnstakingCanceled(address indexed account, uint256 amount); event Withdrawed(address indexed account, uint256 amount); constructor( string memory syntheticTokenName, string memory syntheticTokenSymbol, IERC20 stakingToken_, address owner_, uint256 claimingFeePercent_, uint256 perSecondReward_, uint256 startsAt_, uint256 duration_, uint256 unstakingTime_, uint256 defaultPriceMantissa ) public TwoStageOwnable(owner_) ERC20(syntheticTokenName, syntheticTokenSymbol) { _defaultPrice = AttoDecimal.Instance(defaultPriceMantissa); _stakingToken = stakingToken_; _setClaimingFeePercent(claimingFeePercent_); _validateStrategyParameters(perSecondReward_, startsAt_, duration_); _setUnstakingTime(unstakingTime_); _setCurrentStrategy(perSecondReward_, startsAt_, startsAt_.add(duration_)); lastUpdatedAt = getTimestamp(); _price = _defaultPrice; } /// @notice Cancels unstaking by staking locked for withdrawals tokens /// @param amount Amount of locked for withdrawals tokens function cancelUnstaking(uint256 amount) external onlyPositiveAmount(amount) returns (bool success) { _update(); address caller = msg.sender; Unstake storage unstake_ = _unstakes[caller]; uint256 unstakingAmount = unstake_.amount; require(unstakingAmount >= amount, "Not enough unstaked balance"); uint256 stakedAmount = _price.mul(balanceOf(caller)).floor(); require(stakedAmount.add(amount) >= MIN_STAKE_BALANCE, "Stake balance lt min stake"); uint256 synthAmount = AttoDecimal.div(amount, _price).floor(); _mint(caller, synthAmount); _totalStaked = _totalStaked.add(amount); _totalUnstaked = _totalUnstaked.sub(amount); unstake_.amount = unstakingAmount.sub(amount); emit Staked(caller, address(0), amount, synthAmount); emit UnstakingCanceled(caller, amount); return true; } /// @notice Swaps synthetic tokens for staking tokens and immediately sends them to the caller but takes some fee /// @param amount Staking tokens amount to swap for. Fee will be taked from this amount /// @return claimedAmount Amount of staking tokens that was been sended to caller /// @return burnedAmount Amount of synthetic tokens that was burned while swapping function claim(uint256 amount) external onlyPositiveAmount(amount) returns (uint256 claimedAmount, uint256 burnedAmount) { _update(); address caller = msg.sender; (claimedAmount, burnedAmount) = _calculateUnstake(caller, amount, _price); uint256 fee = claimedAmount.mul(claimingFeePercent).div(100); _burn(caller, burnedAmount); _totalStaked = _totalStaked.sub(claimedAmount); claimedAmount = claimedAmount.sub(fee); _feePool = _feePool.add(fee); emit Claimed(caller, amount, claimedAmount, fee, burnedAmount); _stakingToken.safeTransfer(caller, claimedAmount); } /// @notice Withdraws all staking tokens, that have been accumulated in imidiatly claiming process. /// Allowed to be called only by the owner /// @return amount Amount of accumulated and withdrawed tokens function claimFees() external onlyOwner returns (uint256 amount) { require(_feePool > 0, "No fees"); amount = _feePool; _feePool = 0; emit FeeClaimed(owner(), amount); _stakingToken.safeTransfer(owner(), amount); } /// @notice Creates new strategy. Allowed to be called only by the owner /// @param perSecondReward_ Reward that should be added to common staking tokens pool every second /// @param startsAt_ Timestamp from which strategy should starts /// @param duration_ Seconds count for which new strategy should be applied function createNewStrategy( uint256 perSecondReward_, uint256 startsAt_, uint256 duration_ ) public onlyOwner returns (bool success) { _update(); _validateStrategyParameters(perSecondReward_, startsAt_, duration_); uint256 endsAt = startsAt_.add(duration_); Strategy memory strategy = Strategy({perSecondReward: perSecondReward_, startsAt: startsAt_, endsAt: endsAt}); if (_currentStrategy.startsAt > getTimestamp()) { delete _nextStrategy; emit NextStrategyRemoved(); _currentStrategy = strategy; emit CurrentStrategyUpdated(perSecondReward_, startsAt_, endsAt); } else { emit NextStrategyUpdated(perSecondReward_, startsAt_, endsAt); _nextStrategy = strategy; if (_currentStrategy.endsAt > startsAt_) { _currentStrategy.endsAt = startsAt_; emit CurrentStrategyUpdated(_currentStrategy.perSecondReward, _currentStrategy.startsAt, startsAt_); } } return true; } function decreasePool(uint256 amount) external onlyPositiveAmount(amount) onlyOwner returns (bool success) { _update(); _lockedRewards = _lockedRewards.sub(amount, "Not enough locked rewards"); emit PoolDecreased(amount); _stakingToken.safeTransfer(owner(), amount); return true; } /// @notice Increases pool of rewards /// @param amount Amount of staking tokens (in wei) that should be added to rewards pool function increasePool(uint256 amount) external onlyPositiveAmount(amount) returns (bool success) { _update(); address payer = msg.sender; _lockedRewards = _lockedRewards.add(amount); emit PoolIncreased(payer, amount); _stakingToken.safeTransferFrom(payer, address(this), amount); return true; } /// @notice Change claiming fee percent. Can be called only by the owner /// @param feePercent New claiming fee percent function setClaimingFeePercent(uint256 feePercent) external onlyOwner returns (bool success) { _setClaimingFeePercent(feePercent); return true; } /// @notice Converts staking tokens to synthetic tokens /// @param amount Amount of staking tokens to be swapped /// @return mintedAmount Amount of synthetic tokens that was received at swapping process function stake(uint256 amount) external onlyPositiveAmount(amount) returns (uint256 mintedAmount) { address staker = msg.sender; return _stake(staker, staker, amount); } /// @notice Converts staking tokens to synthetic tokens and sends them to specific account /// @param account Receiver of synthetic tokens /// @param amount Amount of staking tokens to be swapped /// @return mintedAmount Amount of synthetic tokens that was received by specified account at swapping process function stakeForUser(address account, uint256 amount) external onlyPositiveAmount(amount) returns (uint256 mintedAmount) { return _stake(account, msg.sender, amount); } /// @notice Swapes synthetic tokens for staking tokens and locks them for some period /// @param amount Minimum amount of staking tokens that should be locked after swapping process /// @return unstakedAmount Amount of staking tokens that was locked /// @return burnedAmount Amount of synthetic tokens that was burned function unstake(uint256 amount) external onlyPositiveAmount(amount) returns (uint256 unstakedAmount, uint256 burnedAmount) { _update(); address caller = msg.sender; (unstakedAmount, burnedAmount) = _calculateUnstake(caller, amount, _price); _burn(caller, burnedAmount); _totalStaked = _totalStaked.sub(unstakedAmount); _totalUnstaked = _totalUnstaked.add(unstakedAmount); Unstake storage unstake_ = _unstakes[caller]; unstake_.amount = unstake_.amount.add(unstakedAmount); unstake_.applicableAt = getTimestamp().add(_unstakingTime); emit Unstaked(caller, amount, unstakedAmount, burnedAmount); } /// @notice Updates price of synthetic token /// @dev Automatically has been called on every contract action, that uses or can affect price function update() external returns (bool success) { _update(); return true; } /// @notice Withdraws unstaked staking tokens function withdraw() external returns (bool success) { address caller = msg.sender; Unstake storage unstake_ = _unstakes[caller]; uint256 amount = unstake_.amount; require(amount > 0, "Not unstaked"); require(unstake_.applicableAt <= getTimestamp(), "Not released at"); delete _unstakes[caller]; _totalUnstaked = _totalUnstaked.sub(amount); emit Withdrawed(caller, amount); _stakingToken.safeTransfer(caller, amount); return true; } /// @notice Change unstaking time. Can be called only by the owner /// @param unstakingTime_ New unstaking process duration in seconds function setUnstakingTime(uint256 unstakingTime_) external onlyOwner returns (bool success) { _setUnstakingTime(unstakingTime_); return true; } function _getStrategyUnlockedRewards(Strategy memory strategy_) internal view returns (uint256 unlocked) { uint256 timestamp = getTimestamp(); if (timestamp < strategy_.startsAt || timestamp == lastUpdatedAt) { return unlocked; } uint256 lastRewardedSecond = Math.max(lastUpdatedAt, strategy_.startsAt); uint256 lastRewardableTimestamp = Math.min(timestamp, strategy_.endsAt); if (lastRewardedSecond < lastRewardableTimestamp) { uint256 timeDiff = lastRewardableTimestamp.sub(lastRewardedSecond); unlocked = unlocked.add(timeDiff.mul(strategy_.perSecondReward)); } } function _calculateUnstake( address account, uint256 amount, AttoDecimal.Instance memory price_ ) internal view returns (uint256 unstakedAmount, uint256 burnedAmount) { unstakedAmount = amount; burnedAmount = AttoDecimal.div(amount, price_).ceil(); uint256 balance = balanceOf(account); require(burnedAmount > 0, "Too small unstaking amount"); require(balance >= burnedAmount, "Not enough synthetic tokens"); uint256 remainingSyntheticBalance = balance.sub(burnedAmount); uint256 remainingStake = _price.mul(remainingSyntheticBalance).floor(); if (remainingStake < 10**18) { burnedAmount = balance; unstakedAmount = unstakedAmount.add(remainingStake); } } function _unlockRewardsAndStake() internal { (uint256 unlocked, bool currentStrategyEnded) = getUnlockedRewards(); if (currentStrategyEnded) { _currentStrategy = _nextStrategy; emit NextStrategyRemoved(); if (_currentStrategy.endsAt != 0) { emit CurrentStrategyUpdated( _currentStrategy.perSecondReward, _currentStrategy.startsAt, _currentStrategy.endsAt ); } delete _nextStrategy; } unlocked = Math.min(unlocked, _lockedRewards); if (unlocked > 0) { emit RewardsUnlocked(unlocked); _lockedRewards = _lockedRewards.sub(unlocked); _totalStaked = _totalStaked.add(unlocked); } lastUpdatedAt = getTimestamp(); } function _update() internal { if (getTimestamp() <= lastUpdatedAt) return; _unlockRewardsAndStake(); _updatePrice(); } function _updatePrice() internal { uint256 totalStaked_ = _totalStaked; uint256 totalSupply_ = totalSupply(); if (totalSupply_ == 0) _price = _defaultPrice; else _price = AttoDecimal.div(totalStaked_, totalSupply_); emit PriceUpdated(_price.mantissa, AttoDecimal.BASE, AttoDecimal.EXPONENTIATION); } function _validateStrategyParameters( uint256 perSecondReward, uint256 startsAt, uint256 duration ) internal view { require(duration > 0, "Duration is zero"); require(startsAt >= getTimestamp(), "Starting timestamp lt current"); require(perSecondReward <= 188 * 10**18, "Per second reward overflow"); } function _setClaimingFeePercent(uint256 feePercent) internal { require(feePercent >= 0 && feePercent <= 100, "Invalid fee percent"); claimingFeePercent = feePercent; emit ClaimingFeePercentUpdated(feePercent); } function _setUnstakingTime(uint256 unstakingTime_) internal { _unstakingTime = unstakingTime_; emit UnstakingTimeUpdated(unstakingTime_); } function _beforeTokenTransfer( address from, address to, uint256 amount ) internal override { _update(); string memory errorText = "Minimal stake balance should be more or equal to 1 token"; if (from != address(0)) { uint256 fromNewBalance = _price.mul(balanceOf(from).sub(amount)).floor(); require(fromNewBalance >= MIN_STAKE_BALANCE || fromNewBalance == 0, errorText); } if (to != address(0)) { require(_price.mul(balanceOf(to).add(amount)).floor() >= MIN_STAKE_BALANCE, errorText); } } function _setCurrentStrategy( uint256 perSecondReward_, uint256 startsAt_, uint256 endsAt_ ) private { _currentStrategy = Strategy({perSecondReward: perSecondReward_, startsAt: startsAt_, endsAt: endsAt_}); emit CurrentStrategyUpdated(perSecondReward_, startsAt_, endsAt_); } function _stake( address staker, address payer, uint256 amount ) private returns (uint256 mintedAmount) { _update(); mintedAmount = AttoDecimal.div(amount, _price).floor(); require(mintedAmount > 0, "Too small staking amount"); _mint(staker, mintedAmount); _totalStaked = _totalStaked.add(amount); emit Staked(staker, payer, amount, mintedAmount); _stakingToken.safeTransferFrom(payer, address(this), amount); } modifier onlyPositiveAmount(uint256 amount) { require(amount > 0, "Amount is not positive"); _; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address payable) { return msg.sender; } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a >= b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow, so we distribute return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return sub(a, b, "SafeMath: subtraction overflow"); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return div(a, b, "SafeMath: division by zero"); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return mod(a, b, "SafeMath: modulo by zero"); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "../../GSN/Context.sol"; import "./IERC20.sol"; import "../../math/SafeMath.sol"; import "../../utils/Address.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin guidelines: functions revert instead * of returning `false` on failure. This behavior is nonetheless conventional * and does not conflict with the expectations of ERC20 applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20 { using SafeMath for uint256; using Address for address; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ constructor (string memory name, string memory symbol) public { _name = name; _symbol = symbol; _decimals = 18; } /** * @dev Returns the name of the token. */ function name() public view returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5,05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is * called. * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}; * * Requirements: * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) { _transfer(sender, recipient, amount); _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue)); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer(address sender, address recipient, uint256 amount) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); _balances[recipient] = _balances[recipient].add(amount); emit Transfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements * * - `to` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); emit Transfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance"); _totalSupply = _totalSupply.sub(amount); emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve(address owner, address spender, uint256 amount) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Sets {decimals} to a value other than the default one of 18. * * WARNING: This function should only be called from the constructor. Most * applications that interact with token contracts will not expect * {decimals} to ever change, and may work incorrectly if it does. */ function _setupDecimals(uint8 decimals_) internal { _decimals = decimals_; } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be to transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "./IERC20.sol"; import "../../math/SafeMath.sol"; import "../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using SafeMath for uint256; using Address for address; function safeTransfer(IERC20 token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove(IERC20 token, address spender, uint256 value) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' // solhint-disable-next-line max-line-length require((value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).add(value); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero"); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.2; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies in extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{ value: amount }(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return _functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); return _functionCallWithValue(target, data, value, errorMessage); } function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) { require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: weiValue }(data); if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor () internal { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and make it call a * `private` function that does the actual work. */ modifier nonReentrant() { // On the first call to nonReentrant, _notEntered will be true require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; _; // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.12; import "openzeppelin-solidity/contracts/math/SafeMath.sol"; library AttoDecimal { using SafeMath for uint256; struct Instance { uint256 mantissa; } uint256 internal constant BASE = 10; uint256 internal constant EXPONENTIATION = 18; uint256 internal constant ONE_MANTISSA = BASE**EXPONENTIATION; uint256 internal constant ONE_TENTH_MANTISSA = ONE_MANTISSA / 10; uint256 internal constant HALF_MANTISSA = ONE_MANTISSA / 2; uint256 internal constant SQUARED_ONE_MANTISSA = ONE_MANTISSA * ONE_MANTISSA; uint256 internal constant MAX_INTEGER = uint256(-1) / ONE_MANTISSA; function maximum() internal pure returns (Instance memory) { return Instance({mantissa: uint256(-1)}); } function zero() internal pure returns (Instance memory) { return Instance({mantissa: 0}); } function one() internal pure returns (Instance memory) { return Instance({mantissa: ONE_MANTISSA}); } function convert(uint256 integer) internal pure returns (Instance memory) { return Instance({mantissa: integer.mul(ONE_MANTISSA)}); } function compare(Instance memory a, Instance memory b) internal pure returns (int8) { if (a.mantissa < b.mantissa) return -1; return int8(a.mantissa > b.mantissa ? 1 : 0); } function compare(Instance memory a, uint256 b) internal pure returns (int8) { return compare(a, convert(b)); } function add(Instance memory a, Instance memory b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.add(b.mantissa)}); } function add(Instance memory a, uint256 b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.add(b.mul(ONE_MANTISSA))}); } function sub(Instance memory a, Instance memory b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.sub(b.mantissa)}); } function sub(Instance memory a, uint256 b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.sub(b.mul(ONE_MANTISSA))}); } function sub(uint256 a, Instance memory b) internal pure returns (Instance memory) { return Instance({mantissa: a.mul(ONE_MANTISSA).sub(b.mantissa)}); } function mul(Instance memory a, Instance memory b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.mul(b.mantissa) / ONE_MANTISSA}); } function mul(Instance memory a, uint256 b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.mul(b)}); } function div(Instance memory a, Instance memory b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.mul(ONE_MANTISSA).div(b.mantissa)}); } function div(Instance memory a, uint256 b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.mul(ONE_MANTISSA).div(b)}); } function div(uint256 a, Instance memory b) internal pure returns (Instance memory) { return Instance({mantissa: a.mul(SQUARED_ONE_MANTISSA).div(b.mantissa)}); } function div(uint256 a, uint256 b) internal pure returns (Instance memory) { return Instance({mantissa: a.mul(ONE_MANTISSA).div(b)}); } function idiv(Instance memory a, Instance memory b) internal pure returns (uint256) { return a.mantissa.div(b.mantissa); } function idiv(Instance memory a, uint256 b) internal pure returns (uint256) { return a.mantissa.div(b.mul(ONE_MANTISSA)); } function idiv(uint256 a, Instance memory b) internal pure returns (uint256) { return a.mul(ONE_MANTISSA).div(b.mantissa); } function mod(Instance memory a, Instance memory b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.mod(b.mantissa)}); } function mod(Instance memory a, uint256 b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.mod(b.mul(ONE_MANTISSA))}); } function mod(uint256 a, Instance memory b) internal pure returns (Instance memory) { if (a > MAX_INTEGER) return Instance({mantissa: a.mod(b.mantissa).mul(ONE_MANTISSA) % b.mantissa}); return Instance({mantissa: a.mul(ONE_MANTISSA).mod(b.mantissa)}); } function floor(Instance memory a) internal pure returns (uint256) { return a.mantissa / ONE_MANTISSA; } function ceil(Instance memory a) internal pure returns (uint256) { return (a.mantissa / ONE_MANTISSA) + (a.mantissa % ONE_MANTISSA > 0 ? 1 : 0); } function round(Instance memory a) internal pure returns (uint256) { return (a.mantissa / ONE_MANTISSA) + ((a.mantissa / ONE_TENTH_MANTISSA) % 10 >= 5 ? 1 : 0); } function eq(Instance memory a, Instance memory b) internal pure returns (bool) { return a.mantissa == b.mantissa; } function eq(Instance memory a, uint256 b) internal pure returns (bool) { if (b > MAX_INTEGER) return false; return a.mantissa == b * ONE_MANTISSA; } function gt(Instance memory a, Instance memory b) internal pure returns (bool) { return a.mantissa > b.mantissa; } function gt(Instance memory a, uint256 b) internal pure returns (bool) { if (b > MAX_INTEGER) return false; return a.mantissa > b * ONE_MANTISSA; } function gte(Instance memory a, Instance memory b) internal pure returns (bool) { return a.mantissa >= b.mantissa; } function gte(Instance memory a, uint256 b) internal pure returns (bool) { if (b > MAX_INTEGER) return false; return a.mantissa >= b * ONE_MANTISSA; } function lt(Instance memory a, Instance memory b) internal pure returns (bool) { return a.mantissa < b.mantissa; } function lt(Instance memory a, uint256 b) internal pure returns (bool) { if (b > MAX_INTEGER) return true; return a.mantissa < b * ONE_MANTISSA; } function lte(Instance memory a, Instance memory b) internal pure returns (bool) { return a.mantissa <= b.mantissa; } function lte(Instance memory a, uint256 b) internal pure returns (bool) { if (b > MAX_INTEGER) return true; return a.mantissa <= b * ONE_MANTISSA; } function isInteger(Instance memory a) internal pure returns (bool) { return a.mantissa % ONE_MANTISSA == 0; } function isPositive(Instance memory a) internal pure returns (bool) { return a.mantissa > 0; } function isZero(Instance memory a) internal pure returns (bool) { return a.mantissa == 0; } function sum(Instance[] memory array) internal pure returns (Instance memory result) { uint256 length = array.length; for (uint256 index = 0; index < length; index++) result = add(result, array[index]); } function toTuple(Instance memory a) internal pure returns ( uint256 mantissa, uint256 base, uint256 exponentiation ) { return (a.mantissa, BASE, EXPONENTIATION); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.12; abstract contract TwoStageOwnable { address private _nominatedOwner; address private _owner; function nominatedOwner() public view returns (address) { return _nominatedOwner; } function owner() public view returns (address) { return _owner; } event OwnerChanged(address indexed newOwner); event OwnerNominated(address indexed nominatedOwner); constructor(address owner_) internal { require(owner_ != address(0), "Owner is zero"); _setOwner(owner_); } function acceptOwnership() external returns (bool success) { require(msg.sender == _nominatedOwner, "Not nominated to ownership"); _setOwner(_nominatedOwner); return true; } function nominateNewOwner(address owner_) external onlyOwner returns (bool success) { _nominateNewOwner(owner_); return true; } modifier onlyOwner { require(msg.sender == _owner, "Not owner"); _; } function _nominateNewOwner(address owner_) internal { if (_nominatedOwner == owner_) return; require(_owner != owner_, "Already owner"); _nominatedOwner = owner_; emit OwnerNominated(owner_); } function _setOwner(address newOwner) internal { if (_owner == newOwner) return; _owner = newOwner; _nominatedOwner = address(0); emit OwnerChanged(newOwner); } }
{ "remappings": [], "optimizer": { "enabled": true, "runs": 200 }, "evmVersion": "constantinople", "libraries": {}, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } } }
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- No Contract Security Audit Submitted- Submit Audit Here
[{"inputs":[{"internalType":"string","name":"syntheticTokenName","type":"string"},{"internalType":"string","name":"syntheticTokenSymbol","type":"string"},{"internalType":"contract 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Contract Creation Code
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