{"sources":{"BalancerGovernanceToken.sol":{"content":"// SPDX-License-Identifier: MIT\r\n\r\n// File @openzeppelin/contracts/utils/EnumerableSet.sol@v3.0.1\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Library for managing\r\n * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive\r\n * types.\r\n *\r\n * Sets have the following properties:\r\n *\r\n * - Elements are added, removed, and checked for existence in constant time\r\n * (O(1)).\r\n * - Elements are enumerated in O(n). No guarantees are made on the ordering.\r\n *\r\n * ```\r\n * contract Example {\r\n *     // Add the library methods\r\n *     using EnumerableSet for EnumerableSet.AddressSet;\r\n *\r\n *     // Declare a set state variable\r\n *     EnumerableSet.AddressSet private mySet;\r\n * }\r\n * ```\r\n *\r\n * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`\r\n * (`UintSet`) are supported.\r\n */\r\nlibrary EnumerableSet {\r\n    // To implement this library for multiple types with as little code\r\n    // repetition as possible, we write it in terms of a generic Set type with\r\n    // bytes32 values.\r\n    // The Set implementation uses private functions, and user-facing\r\n    // implementations (such as AddressSet) are just wrappers around the\r\n    // underlying Set.\r\n    // This means that we can only create new EnumerableSets for types that fit\r\n    // in bytes32.\r\n\r\n    struct Set {\r\n        // Storage of set values\r\n        bytes32[] _values;\r\n\r\n        // Position of the value in the `values` array, plus 1 because index 0\r\n        // means a value is not in the set.\r\n        mapping (bytes32 => uint256) _indexes;\r\n    }\r\n\r\n    /**\r\n     * @dev Add a value to a set. O(1).\r\n     *\r\n     * Returns true if the value was added to the set, that is if it was not\r\n     * already present.\r\n     */\r\n    function _add(Set storage set, bytes32 value) private returns (bool) {\r\n        if (!_contains(set, value)) {\r\n            set._values.push(value);\r\n            // The value is stored at length-1, but we add 1 to all indexes\r\n            // and use 0 as a sentinel value\r\n            set._indexes[value] = set._values.length;\r\n            return true;\r\n        } else {\r\n            return false;\r\n        }\r\n    }\r\n\r\n    /**\r\n     * @dev Removes a value from a set. O(1).\r\n     *\r\n     * Returns true if the value was removed from the set, that is if it was\r\n     * present.\r\n     */\r\n    function _remove(Set storage set, bytes32 value) private returns (bool) {\r\n        // We read and store the value's index to prevent multiple reads from the same storage slot\r\n        uint256 valueIndex = set._indexes[value];\r\n\r\n        if (valueIndex != 0) { // Equivalent to contains(set, value)\r\n            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in\r\n            // the array, and then remove the last element (sometimes called as 'swap and pop').\r\n            // This modifies the order of the array, as noted in {at}.\r\n\r\n            uint256 toDeleteIndex = valueIndex - 1;\r\n            uint256 lastIndex = set._values.length - 1;\r\n\r\n            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs\r\n            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.\r\n\r\n            bytes32 lastvalue = set._values[lastIndex];\r\n\r\n            // Move the last value to the index where the value to delete is\r\n            set._values[toDeleteIndex] = lastvalue;\r\n            // Update the index for the moved value\r\n            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based\r\n\r\n            // Delete the slot where the moved value was stored\r\n            set._values.pop();\r\n\r\n            // Delete the index for the deleted slot\r\n            delete set._indexes[value];\r\n\r\n            return true;\r\n        } else {\r\n            return false;\r\n        }\r\n    }\r\n\r\n    /**\r\n     * @dev Returns true if the value is in the set. O(1).\r\n     */\r\n    function _contains(Set storage set, bytes32 value) private view returns (bool) {\r\n        return set._indexes[value] != 0;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the number of values on the set. O(1).\r\n     */\r\n    function _length(Set storage set) private view returns (uint256) {\r\n        return set._values.length;\r\n    }\r\n\r\n   /**\r\n    * @dev Returns the value stored at position `index` in the set. O(1).\r\n    *\r\n    * Note that there are no guarantees on the ordering of values inside the\r\n    * array, and it may change when more values are added or removed.\r\n    *\r\n    * Requirements:\r\n    *\r\n    * - `index` must be strictly less than {length}.\r\n    */\r\n    function _at(Set storage set, uint256 index) private view returns (bytes32) {\r\n        require(set._values.length > index, \"EnumerableSet: index out of bounds\");\r\n        return set._values[index];\r\n    }\r\n\r\n    // AddressSet\r\n\r\n    struct AddressSet {\r\n        Set _inner;\r\n    }\r\n\r\n    /**\r\n     * @dev Add a value to a set. O(1).\r\n     *\r\n     * Returns true if the value was added to the set, that is if it was not\r\n     * already present.\r\n     */\r\n    function add(AddressSet storage set, address value) internal returns (bool) {\r\n        return _add(set._inner, bytes32(uint256(value)));\r\n    }\r\n\r\n    /**\r\n     * @dev Removes a value from a set. O(1).\r\n     *\r\n     * Returns true if the value was removed from the set, that is if it was\r\n     * present.\r\n     */\r\n    function remove(AddressSet storage set, address value) internal returns (bool) {\r\n        return _remove(set._inner, bytes32(uint256(value)));\r\n    }\r\n\r\n    /**\r\n     * @dev Returns true if the value is in the set. O(1).\r\n     */\r\n    function contains(AddressSet storage set, address value) internal view returns (bool) {\r\n        return _contains(set._inner, bytes32(uint256(value)));\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the number of values in the set. O(1).\r\n     */\r\n    function length(AddressSet storage set) internal view returns (uint256) {\r\n        return _length(set._inner);\r\n    }\r\n\r\n   /**\r\n    * @dev Returns the value stored at position `index` in the set. O(1).\r\n    *\r\n    * Note that there are no guarantees on the ordering of values inside the\r\n    * array, and it may change when more values are added or removed.\r\n    *\r\n    * Requirements:\r\n    *\r\n    * - `index` must be strictly less than {length}.\r\n    */\r\n    function at(AddressSet storage set, uint256 index) internal view returns (address) {\r\n        return address(uint256(_at(set._inner, index)));\r\n    }\r\n\r\n\r\n    // UintSet\r\n\r\n    struct UintSet {\r\n        Set _inner;\r\n    }\r\n\r\n    /**\r\n     * @dev Add a value to a set. O(1).\r\n     *\r\n     * Returns true if the value was added to the set, that is if it was not\r\n     * already present.\r\n     */\r\n    function add(UintSet storage set, uint256 value) internal returns (bool) {\r\n        return _add(set._inner, bytes32(value));\r\n    }\r\n\r\n    /**\r\n     * @dev Removes a value from a set. O(1).\r\n     *\r\n     * Returns true if the value was removed from the set, that is if it was\r\n     * present.\r\n     */\r\n    function remove(UintSet storage set, uint256 value) internal returns (bool) {\r\n        return _remove(set._inner, bytes32(value));\r\n    }\r\n\r\n    /**\r\n     * @dev Returns true if the value is in the set. O(1).\r\n     */\r\n    function contains(UintSet storage set, uint256 value) internal view returns (bool) {\r\n        return _contains(set._inner, bytes32(value));\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the number of values on the set. O(1).\r\n     */\r\n    function length(UintSet storage set) internal view returns (uint256) {\r\n        return _length(set._inner);\r\n    }\r\n\r\n   /**\r\n    * @dev Returns the value stored at position `index` in the set. O(1).\r\n    *\r\n    * Note that there are no guarantees on the ordering of values inside the\r\n    * array, and it may change when more values are added or removed.\r\n    *\r\n    * Requirements:\r\n    *\r\n    * - `index` must be strictly less than {length}.\r\n    */\r\n    function at(UintSet storage set, uint256 index) internal view returns (uint256) {\r\n        return uint256(_at(set._inner, index));\r\n    }\r\n}\r\n\r\n\r\n// File @openzeppelin/contracts/utils/Address.sol@v3.0.1\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n    /**\r\n     * @dev Returns true if `account` is a contract.\r\n     *\r\n     * [IMPORTANT]\r\n     * ====\r\n     * It is unsafe to assume that an address for which this function returns\r\n     * false is an externally-owned account (EOA) and not a contract.\r\n     *\r\n     * Among others, `isContract` will return false for the following\r\n     * types of addresses:\r\n     *\r\n     *  - an externally-owned account\r\n     *  - a contract in construction\r\n     *  - an address where a contract will be created\r\n     *  - an address where a contract lived, but was destroyed\r\n     * ====\r\n     */\r\n    function isContract(address account) internal view returns (bool) {\r\n        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n        // for accounts without code, i.e. `keccak256('')`\r\n        bytes32 codehash;\r\n        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n        // solhint-disable-next-line no-inline-assembly\r\n        assembly { codehash := extcodehash(account) }\r\n        return (codehash != accountHash && codehash != 0x0);\r\n    }\r\n\r\n    /**\r\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n     * `recipient`, forwarding all available gas and reverting on errors.\r\n     *\r\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n     * imposed by `transfer`, making them unable to receive funds via\r\n     * `transfer`. {sendValue} removes this limitation.\r\n     *\r\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n     *\r\n     * IMPORTANT: because control is transferred to `recipient`, care must be\r\n     * taken to not create reentrancy vulnerabilities. Consider using\r\n     * {ReentrancyGuard} or the\r\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n     */\r\n    function sendValue(address payable recipient, uint256 amount) internal {\r\n        require(address(this).balance >= amount, \"Address: insufficient balance\");\r\n\r\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n        (bool success, ) = recipient.call{ value: amount }(\"\");\r\n        require(success, \"Address: unable to send value, recipient may have reverted\");\r\n    }\r\n}\r\n\r\n\r\n// File @openzeppelin/contracts/GSN/Context.sol@v3.0.1\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/*\r\n * @dev Provides information about the current execution context, including the\r\n * sender of the transaction and its data. While these are generally available\r\n * via msg.sender and msg.data, they should not be accessed in such a direct\r\n * manner, since when dealing with GSN meta-transactions the account sending and\r\n * paying for execution may not be the actual sender (as far as an application\r\n * is concerned).\r\n *\r\n * This contract is only required for intermediate, library-like contracts.\r\n */\r\ncontract Context {\r\n    // Empty internal constructor, to prevent people from mistakenly deploying\r\n    // an instance of this contract, which should be used via inheritance.\r\n    constructor () internal { }\r\n\r\n    function _msgSender() internal view virtual returns (address payable) {\r\n        return msg.sender;\r\n    }\r\n\r\n    function _msgData() internal view virtual returns (bytes memory) {\r\n        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691\r\n        return msg.data;\r\n    }\r\n}\r\n\r\n\r\n// File @openzeppelin/contracts/access/AccessControl.sol@v3.0.1\r\n\r\npragma solidity ^0.6.0;\r\n\r\n\r\n\r\n\r\n/**\r\n * @dev Contract module that allows children to implement role-based access\r\n * control mechanisms.\r\n *\r\n * Roles are referred to by their `bytes32` identifier. These should be exposed\r\n * in the external API and be unique. The best way to achieve this is by\r\n * using `public constant` hash digests:\r\n *\r\n * ```\r\n * bytes32 public constant MY_ROLE = keccak256(\"MY_ROLE\");\r\n * ```\r\n *\r\n * Roles can be used to represent a set of permissions. To restrict access to a\r\n * function call, use {hasRole}:\r\n *\r\n * ```\r\n * function foo() public {\r\n *     require(hasRole(MY_ROLE, msg.sender));\r\n *     ...\r\n * }\r\n * ```\r\n *\r\n * Roles can be granted and revoked dynamically via the {grantRole} and\r\n * {revokeRole} functions. Each role has an associated admin role, and only\r\n * accounts that have a role's admin role can call {grantRole} and {revokeRole}.\r\n *\r\n * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means\r\n * that only accounts with this role will be able to grant or revoke other\r\n * roles. More complex role relationships can be created by using\r\n * {_setRoleAdmin}.\r\n *\r\n * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to\r\n * grant and revoke this role. Extra precautions should be taken to secure\r\n * accounts that have been granted it.\r\n */\r\nabstract contract AccessControl is Context {\r\n    using EnumerableSet for EnumerableSet.AddressSet;\r\n    using Address for address;\r\n\r\n    struct RoleData {\r\n        EnumerableSet.AddressSet members;\r\n        bytes32 adminRole;\r\n    }\r\n\r\n    mapping (bytes32 => RoleData) private _roles;\r\n\r\n    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;\r\n\r\n    /**\r\n     * @dev Emitted when `account` is granted `role`.\r\n     *\r\n     * `sender` is the account that originated the contract call, an admin role\r\n     * bearer except when using {_setupRole}.\r\n     */\r\n    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);\r\n\r\n    /**\r\n     * @dev Emitted when `account` is revoked `role`.\r\n     *\r\n     * `sender` is the account that originated the contract call:\r\n     *   - if using `revokeRole`, it is the admin role bearer\r\n     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)\r\n     */\r\n    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);\r\n\r\n    /**\r\n     * @dev Returns `true` if `account` has been granted `role`.\r\n     */\r\n    function hasRole(bytes32 role, address account) public view returns (bool) {\r\n        return _roles[role].members.contains(account);\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the number of accounts that have `role`. Can be used\r\n     * together with {getRoleMember} to enumerate all bearers of a role.\r\n     */\r\n    function getRoleMemberCount(bytes32 role) public view returns (uint256) {\r\n        return _roles[role].members.length();\r\n    }\r\n\r\n    /**\r\n     * @dev Returns one of the accounts that have `role`. `index` must be a\r\n     * value between 0 and {getRoleMemberCount}, non-inclusive.\r\n     *\r\n     * Role bearers are not sorted in any particular way, and their ordering may\r\n     * change at any point.\r\n     *\r\n     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure\r\n     * you perform all queries on the same block. See the following\r\n     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]\r\n     * for more information.\r\n     */\r\n    function getRoleMember(bytes32 role, uint256 index) public view returns (address) {\r\n        return _roles[role].members.at(index);\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the admin role that controls `role`. See {grantRole} and\r\n     * {revokeRole}.\r\n     *\r\n     * To change a role's admin, use {_setRoleAdmin}.\r\n     */\r\n    function getRoleAdmin(bytes32 role) public view returns (bytes32) {\r\n        return _roles[role].adminRole;\r\n    }\r\n\r\n    /**\r\n     * @dev Grants `role` to `account`.\r\n     *\r\n     * If `account` had not been already granted `role`, emits a {RoleGranted}\r\n     * event.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the caller must have ``role``'s admin role.\r\n     */\r\n    function grantRole(bytes32 role, address account) public virtual {\r\n        require(hasRole(_roles[role].adminRole, _msgSender()), \"AccessControl: sender must be an admin to grant\");\r\n\r\n        _grantRole(role, account);\r\n    }\r\n\r\n    /**\r\n     * @dev Revokes `role` from `account`.\r\n     *\r\n     * If `account` had been granted `role`, emits a {RoleRevoked} event.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the caller must have ``role``'s admin role.\r\n     */\r\n    function revokeRole(bytes32 role, address account) public virtual {\r\n        require(hasRole(_roles[role].adminRole, _msgSender()), \"AccessControl: sender must be an admin to revoke\");\r\n\r\n        _revokeRole(role, account);\r\n    }\r\n\r\n    /**\r\n     * @dev Revokes `role` from the calling account.\r\n     *\r\n     * Roles are often managed via {grantRole} and {revokeRole}: this function's\r\n     * purpose is to provide a mechanism for accounts to lose their privileges\r\n     * if they are compromised (such as when a trusted device is misplaced).\r\n     *\r\n     * If the calling account had been granted `role`, emits a {RoleRevoked}\r\n     * event.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - the caller must be `account`.\r\n     */\r\n    function renounceRole(bytes32 role, address account) public virtual {\r\n        require(account == _msgSender(), \"AccessControl: can only renounce roles for self\");\r\n\r\n        _revokeRole(role, account);\r\n    }\r\n\r\n    /**\r\n     * @dev Grants `role` to `account`.\r\n     *\r\n     * If `account` had not been already granted `role`, emits a {RoleGranted}\r\n     * event. Note that unlike {grantRole}, this function doesn't perform any\r\n     * checks on the calling account.\r\n     *\r\n     * [WARNING]\r\n     * ====\r\n     * This function should only be called from the constructor when setting\r\n     * up the initial roles for the system.\r\n     *\r\n     * Using this function in any other way is effectively circumventing the admin\r\n     * system imposed by {AccessControl}.\r\n     * ====\r\n     */\r\n    function _setupRole(bytes32 role, address account) internal virtual {\r\n        _grantRole(role, account);\r\n    }\r\n\r\n    /**\r\n     * @dev Sets `adminRole` as ``role``'s admin role.\r\n     */\r\n    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {\r\n        _roles[role].adminRole = adminRole;\r\n    }\r\n\r\n    function _grantRole(bytes32 role, address account) private {\r\n        if (_roles[role].members.add(account)) {\r\n            emit RoleGranted(role, account, _msgSender());\r\n        }\r\n    }\r\n\r\n    function _revokeRole(bytes32 role, address account) private {\r\n        if (_roles[role].members.remove(account)) {\r\n            emit RoleRevoked(role, account, _msgSender());\r\n        }\r\n    }\r\n}\r\n\r\n\r\n// File @openzeppelin/contracts/math/SafeMath.sol@v3.0.1\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n    /**\r\n     * @dev Returns the addition of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `+` operator.\r\n     *\r\n     * Requirements:\r\n     * - Addition cannot overflow.\r\n     */\r\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        uint256 c = a + b;\r\n        require(c >= a, \"SafeMath: addition overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return sub(a, b, \"SafeMath: subtraction overflow\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n     * overflow (when the result is negative).\r\n     *\r\n     * Counterpart to Solidity's `-` operator.\r\n     *\r\n     * Requirements:\r\n     * - Subtraction cannot overflow.\r\n     */\r\n    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\r\n        require(b <= a, errorMessage);\r\n        uint256 c = a - b;\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the multiplication of two unsigned integers, reverting on\r\n     * overflow.\r\n     *\r\n     * Counterpart to Solidity's `*` operator.\r\n     *\r\n     * Requirements:\r\n     * - Multiplication cannot overflow.\r\n     */\r\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n        // benefit is lost if 'b' is also tested.\r\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n        if (a == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 c = a * b;\r\n        require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return div(a, b, \"SafeMath: division by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n     * division by zero. The result is rounded towards zero.\r\n     *\r\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n     * uses an invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\r\n        // Solidity only automatically asserts when dividing by 0\r\n        require(b > 0, errorMessage);\r\n        uint256 c = a / b;\r\n        // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n        return c;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return mod(a, b, \"SafeMath: modulo by zero\");\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n     * Reverts with custom message when dividing by zero.\r\n     *\r\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n     * invalid opcode to revert (consuming all remaining gas).\r\n     *\r\n     * Requirements:\r\n     * - The divisor cannot be zero.\r\n     */\r\n    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\r\n        require(b != 0, errorMessage);\r\n        return a % b;\r\n    }\r\n}\r\n\r\n\r\n// File @openzeppelin/contracts/math/Math.sol@v3.0.1\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Standard math utilities missing in the Solidity language.\r\n */\r\nlibrary Math {\r\n    /**\r\n     * @dev Returns the largest of two numbers.\r\n     */\r\n    function max(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return a >= b ? a : b;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the smallest of two numbers.\r\n     */\r\n    function min(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return a < b ? a : b;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the average of two numbers. The result is rounded towards\r\n     * zero.\r\n     */\r\n    function average(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        // (a + b) / 2 can overflow, so we distribute\r\n        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);\r\n    }\r\n}\r\n\r\n\r\n// File @openzeppelin/contracts/utils/Arrays.sol@v3.0.1\r\n\r\npragma solidity ^0.6.0;\r\n\r\n\r\n/**\r\n * @dev Collection of functions related to array types.\r\n */\r\nlibrary Arrays {\r\n   /**\r\n     * @dev Searches a sorted `array` and returns the first index that contains\r\n     * a value greater or equal to `element`. If no such index exists (i.e. all\r\n     * values in the array are strictly less than `element`), the array length is\r\n     * returned. Time complexity O(log n).\r\n     *\r\n     * `array` is expected to be sorted in ascending order, and to contain no\r\n     * repeated elements.\r\n     */\r\n    function findUpperBound(uint256[] storage array, uint256 element) internal view returns (uint256) {\r\n        if (array.length == 0) {\r\n            return 0;\r\n        }\r\n\r\n        uint256 low = 0;\r\n        uint256 high = array.length;\r\n\r\n        while (low < high) {\r\n            uint256 mid = Math.average(low, high);\r\n\r\n            // Note that mid will always be strictly less than high (i.e. it will be a valid array index)\r\n            // because Math.average rounds down (it does integer division with truncation).\r\n            if (array[mid] > element) {\r\n                high = mid;\r\n            } else {\r\n                low = mid + 1;\r\n            }\r\n        }\r\n\r\n        // At this point `low` is the exclusive upper bound. We will return the inclusive upper bound.\r\n        if (low > 0 && array[low - 1] == element) {\r\n            return low - 1;\r\n        } else {\r\n            return low;\r\n        }\r\n    }\r\n}\r\n\r\n\r\n// File @openzeppelin/contracts/utils/Counters.sol@v3.0.1\r\n\r\npragma solidity ^0.6.0;\r\n\r\n\r\n/**\r\n * @title Counters\r\n * @author Matt Condon (@shrugs)\r\n * @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number\r\n * of elements in a mapping, issuing ERC721 ids, or counting request ids.\r\n *\r\n * Include with `using Counters for Counters.Counter;`\r\n * Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the {SafeMath}\r\n * overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never\r\n * directly accessed.\r\n */\r\nlibrary Counters {\r\n    using SafeMath for uint256;\r\n\r\n    struct Counter {\r\n        // This variable should never be directly accessed by users of the library: interactions must be restricted to\r\n        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add\r\n        // this feature: see https://github.com/ethereum/solidity/issues/4637\r\n        uint256 _value; // default: 0\r\n    }\r\n\r\n    function current(Counter storage counter) internal view returns (uint256) {\r\n        return counter._value;\r\n    }\r\n\r\n    function increment(Counter storage counter) internal {\r\n        // The {SafeMath} overflow check can be skipped here, see the comment at the top\r\n        counter._value += 1;\r\n    }\r\n\r\n    function decrement(Counter storage counter) internal {\r\n        counter._value = counter._value.sub(1);\r\n    }\r\n}\r\n\r\n\r\n// File @openzeppelin/contracts/token/ERC20/IERC20.sol@v3.0.1\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n    /**\r\n     * @dev Returns the amount of tokens in existence.\r\n     */\r\n    function totalSupply() external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Returns the amount of tokens owned by `account`.\r\n     */\r\n    function balanceOf(address account) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transfer(address recipient, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Returns the remaining number of tokens that `spender` will be\r\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n     * zero by default.\r\n     *\r\n     * This value changes when {approve} or {transferFrom} are called.\r\n     */\r\n    function allowance(address owner, address spender) external view returns (uint256);\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n     * that someone may use both the old and the new allowance by unfortunate\r\n     * transaction ordering. One possible solution to mitigate this race\r\n     * condition is to first reduce the spender's allowance to 0 and set the\r\n     * desired value afterwards:\r\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n     *\r\n     * Emits an {Approval} event.\r\n     */\r\n    function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n     * allowance mechanism. `amount` is then deducted from the caller's\r\n     * allowance.\r\n     *\r\n     * Returns a boolean value indicating whether the operation succeeded.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     */\r\n    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);\r\n\r\n    /**\r\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n     * another (`to`).\r\n     *\r\n     * Note that `value` may be zero.\r\n     */\r\n    event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n    /**\r\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n     * a call to {approve}. `value` is the new allowance.\r\n     */\r\n    event Approval(address indexed owner, address indexed spender, uint256 value);\r\n}\r\n\r\n\r\n// File @openzeppelin/contracts/token/ERC20/ERC20.sol@v3.0.1\r\n\r\npragma solidity ^0.6.0;\r\n\r\n\r\n\r\n\r\n\r\n/**\r\n * @dev Implementation of the {IERC20} interface.\r\n *\r\n * This implementation is agnostic to the way tokens are created. This means\r\n * that a supply mechanism has to be added in a derived contract using {_mint}.\r\n * For a generic mechanism see {ERC20MinterPauser}.\r\n *\r\n * TIP: For a detailed writeup see our guide\r\n * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How\r\n * to implement supply mechanisms].\r\n *\r\n * We have followed general OpenZeppelin guidelines: functions revert instead\r\n * of returning `false` on failure. This behavior is nonetheless conventional\r\n * and does not conflict with the expectations of ERC20 applications.\r\n *\r\n * Additionally, an {Approval} event is emitted on calls to {transferFrom}.\r\n * This allows applications to reconstruct the allowance for all accounts just\r\n * by listening to said events. Other implementations of the EIP may not emit\r\n * these events, as it isn't required by the specification.\r\n *\r\n * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}\r\n * functions have been added to mitigate the well-known issues around setting\r\n * allowances. See {IERC20-approve}.\r\n */\r\ncontract ERC20 is Context, IERC20 {\r\n    using SafeMath for uint256;\r\n    using Address for address;\r\n\r\n    mapping (address => uint256) private _balances;\r\n\r\n    mapping (address => mapping (address => uint256)) private _allowances;\r\n\r\n    uint256 private _totalSupply;\r\n\r\n    string private _name;\r\n    string private _symbol;\r\n    uint8 private _decimals;\r\n\r\n    /**\r\n     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with\r\n     * a default value of 18.\r\n     *\r\n     * To select a different value for {decimals}, use {_setupDecimals}.\r\n     *\r\n     * All three of these values are immutable: they can only be set once during\r\n     * construction.\r\n     */\r\n    constructor (string memory name, string memory symbol) public {\r\n        _name = name;\r\n        _symbol = symbol;\r\n        _decimals = 18;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the name of the token.\r\n     */\r\n    function name() public view returns (string memory) {\r\n        return _name;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the symbol of the token, usually a shorter version of the\r\n     * name.\r\n     */\r\n    function symbol() public view returns (string memory) {\r\n        return _symbol;\r\n    }\r\n\r\n    /**\r\n     * @dev Returns the number of decimals used to get its user representation.\r\n     * For example, if `decimals` equals `2`, a balance of `505` tokens should\r\n     * be displayed to a user as `5,05` (`505 / 10 ** 2`).\r\n     *\r\n     * Tokens usually opt for a value of 18, imitating the relationship between\r\n     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is\r\n     * called.\r\n     *\r\n     * NOTE: This information is only used for _display_ purposes: it in\r\n     * no way affects any of the arithmetic of the contract, including\r\n     * {IERC20-balanceOf} and {IERC20-transfer}.\r\n     */\r\n    function decimals() public view returns (uint8) {\r\n        return _decimals;\r\n    }\r\n\r\n    /**\r\n     * @dev See {IERC20-totalSupply}.\r\n     */\r\n    function totalSupply() public view override returns (uint256) {\r\n        return _totalSupply;\r\n    }\r\n\r\n    /**\r\n     * @dev See {IERC20-balanceOf}.\r\n     */\r\n    function balanceOf(address account) public view override returns (uint256) {\r\n        return _balances[account];\r\n    }\r\n\r\n    /**\r\n     * @dev See {IERC20-transfer}.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `recipient` cannot be the zero address.\r\n     * - the caller must have a balance of at least `amount`.\r\n     */\r\n    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {\r\n        _transfer(_msgSender(), recipient, amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev See {IERC20-allowance}.\r\n     */\r\n    function allowance(address owner, address spender) public view virtual override returns (uint256) {\r\n        return _allowances[owner][spender];\r\n    }\r\n\r\n    /**\r\n     * @dev See {IERC20-approve}.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `spender` cannot be the zero address.\r\n     */\r\n    function approve(address spender, uint256 amount) public virtual override returns (bool) {\r\n        _approve(_msgSender(), spender, amount);\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev See {IERC20-transferFrom}.\r\n     *\r\n     * Emits an {Approval} event indicating the updated allowance. This is not\r\n     * required by the EIP. See the note at the beginning of {ERC20};\r\n     *\r\n     * Requirements:\r\n     * - `sender` and `recipient` cannot be the zero address.\r\n     * - `sender` must have a balance of at least `amount`.\r\n     * - the caller must have allowance for ``sender``'s tokens of at least\r\n     * `amount`.\r\n     */\r\n    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {\r\n        _transfer(sender, recipient, amount);\r\n        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, \"ERC20: transfer amount exceeds allowance\"));\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Atomically increases the allowance granted to `spender` by the caller.\r\n     *\r\n     * This is an alternative to {approve} that can be used as a mitigation for\r\n     * problems described in {IERC20-approve}.\r\n     *\r\n     * Emits an {Approval} event indicating the updated allowance.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `spender` cannot be the zero address.\r\n     */\r\n    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {\r\n        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Atomically decreases the allowance granted to `spender` by the caller.\r\n     *\r\n     * This is an alternative to {approve} that can be used as a mitigation for\r\n     * problems described in {IERC20-approve}.\r\n     *\r\n     * Emits an {Approval} event indicating the updated allowance.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `spender` cannot be the zero address.\r\n     * - `spender` must have allowance for the caller of at least\r\n     * `subtractedValue`.\r\n     */\r\n    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {\r\n        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, \"ERC20: decreased allowance below zero\"));\r\n        return true;\r\n    }\r\n\r\n    /**\r\n     * @dev Moves tokens `amount` from `sender` to `recipient`.\r\n     *\r\n     * This is internal function is equivalent to {transfer}, and can be used to\r\n     * e.g. implement automatic token fees, slashing mechanisms, etc.\r\n     *\r\n     * Emits a {Transfer} event.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `sender` cannot be the zero address.\r\n     * - `recipient` cannot be the zero address.\r\n     * - `sender` must have a balance of at least `amount`.\r\n     */\r\n    function _transfer(address sender, address recipient, uint256 amount) internal virtual {\r\n        require(sender != address(0), \"ERC20: transfer from the zero address\");\r\n        require(recipient != address(0), \"ERC20: transfer to the zero address\");\r\n\r\n        _beforeTokenTransfer(sender, recipient, amount);\r\n\r\n        _balances[sender] = _balances[sender].sub(amount, \"ERC20: transfer amount exceeds balance\");\r\n        _balances[recipient] = _balances[recipient].add(amount);\r\n        emit Transfer(sender, recipient, amount);\r\n    }\r\n\r\n    /** @dev Creates `amount` tokens and assigns them to `account`, increasing\r\n     * the total supply.\r\n     *\r\n     * Emits a {Transfer} event with `from` set to the zero address.\r\n     *\r\n     * Requirements\r\n     *\r\n     * - `to` cannot be the zero address.\r\n     */\r\n    function _mint(address account, uint256 amount) internal virtual {\r\n        require(account != address(0), \"ERC20: mint to the zero address\");\r\n\r\n        _beforeTokenTransfer(address(0), account, amount);\r\n\r\n        _totalSupply = _totalSupply.add(amount);\r\n        _balances[account] = _balances[account].add(amount);\r\n        emit Transfer(address(0), account, amount);\r\n    }\r\n\r\n    /**\r\n     * @dev Destroys `amount` tokens from `account`, reducing the\r\n     * total supply.\r\n     *\r\n     * Emits a {Transfer} event with `to` set to the zero address.\r\n     *\r\n     * Requirements\r\n     *\r\n     * - `account` cannot be the zero address.\r\n     * - `account` must have at least `amount` tokens.\r\n     */\r\n    function _burn(address account, uint256 amount) internal virtual {\r\n        require(account != address(0), \"ERC20: burn from the zero address\");\r\n\r\n        _beforeTokenTransfer(account, address(0), amount);\r\n\r\n        _balances[account] = _balances[account].sub(amount, \"ERC20: burn amount exceeds balance\");\r\n        _totalSupply = _totalSupply.sub(amount);\r\n        emit Transfer(account, address(0), amount);\r\n    }\r\n\r\n    /**\r\n     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.\r\n     *\r\n     * This is internal function is equivalent to `approve`, and can be used to\r\n     * e.g. set automatic allowances for certain subsystems, etc.\r\n     *\r\n     * Emits an {Approval} event.\r\n     *\r\n     * Requirements:\r\n     *\r\n     * - `owner` cannot be the zero address.\r\n     * - `spender` cannot be the zero address.\r\n     */\r\n    function _approve(address owner, address spender, uint256 amount) internal virtual {\r\n        require(owner != address(0), \"ERC20: approve from the zero address\");\r\n        require(spender != address(0), \"ERC20: approve to the zero address\");\r\n\r\n        _allowances[owner][spender] = amount;\r\n        emit Approval(owner, spender, amount);\r\n    }\r\n\r\n    /**\r\n     * @dev Sets {decimals} to a value other than the default one of 18.\r\n     *\r\n     * WARNING: This function should only be called from the constructor. Most\r\n     * applications that interact with token contracts will not expect\r\n     * {decimals} to ever change, and may work incorrectly if it does.\r\n     */\r\n    function _setupDecimals(uint8 decimals_) internal {\r\n        _decimals = decimals_;\r\n    }\r\n\r\n    /**\r\n     * @dev Hook that is called before any transfer of tokens. This includes\r\n     * minting and burning.\r\n     *\r\n     * Calling conditions:\r\n     *\r\n     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\r\n     * will be to transferred to `to`.\r\n     * - when `from` is zero, `amount` tokens will be minted for `to`.\r\n     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.\r\n     * - `from` and `to` are never both zero.\r\n     *\r\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\r\n     */\r\n    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }\r\n}\r\n\r\n\r\n// File @openzeppelin/contracts/token/ERC20/ERC20Snapshot.sol@v3.0.1\r\n\r\npragma solidity ^0.6.0;\r\n\r\n\r\n\r\n\r\n\r\n/**\r\n * @dev This contract extends an ERC20 token with a snapshot mechanism. When a snapshot is created, the balances and\r\n * total supply at the time are recorded for later access.\r\n *\r\n * This can be used to safely create mechanisms based on token balances such as trustless dividends or weighted voting.\r\n * In naive implementations it's possible to perform a \"double spend\" attack by reusing the same balance from different\r\n * accounts. By using snapshots to calculate dividends or voting power, those attacks no longer apply. It can also be\r\n * used to create an efficient ERC20 forking mechanism.\r\n *\r\n * Snapshots are created by the internal {_snapshot} function, which will emit the {Snapshot} event and return a\r\n * snapshot id. To get the total supply at the time of a snapshot, call the function {totalSupplyAt} with the snapshot\r\n * id. To get the balance of an account at the time of a snapshot, call the {balanceOfAt} function with the snapshot id\r\n * and the account address.\r\n *\r\n * ==== Gas Costs\r\n *\r\n * Snapshots are efficient. Snapshot creation is _O(1)_. Retrieval of balances or total supply from a snapshot is _O(log\r\n * n)_ in the number of snapshots that have been created, although _n_ for a specific account will generally be much\r\n * smaller since identical balances in subsequent snapshots are stored as a single entry.\r\n *\r\n * There is a constant overhead for normal ERC20 transfers due to the additional snapshot bookkeeping. This overhead is\r\n * only significant for the first transfer that immediately follows a snapshot for a particular account. Subsequent\r\n * transfers will have normal cost until the next snapshot, and so on.\r\n */\r\nabstract contract ERC20Snapshot is ERC20 {\r\n    // Inspired by Jordi Baylina's MiniMeToken to record historical balances:\r\n    // https://github.com/Giveth/minimd/blob/ea04d950eea153a04c51fa510b068b9dded390cb/contracts/MiniMeToken.sol\r\n\r\n    using SafeMath for uint256;\r\n    using Arrays for uint256[];\r\n    using Counters for Counters.Counter;\r\n\r\n    // Snapshotted values have arrays of ids and the value corresponding to that id. These could be an array of a\r\n    // Snapshot struct, but that would impede usage of functions that work on an array.\r\n    struct Snapshots {\r\n        uint256[] ids;\r\n        uint256[] values;\r\n    }\r\n\r\n    mapping (address => Snapshots) private _accountBalanceSnapshots;\r\n    Snapshots private _totalSupplySnapshots;\r\n\r\n    // Snapshot ids increase monotonically, with the first value being 1. An id of 0 is invalid.\r\n    Counters.Counter private _currentSnapshotId;\r\n\r\n    /**\r\n     * @dev Emitted by {_snapshot} when a snapshot identified by `id` is created.\r\n     */\r\n    event Snapshot(uint256 id);\r\n\r\n    /**\r\n     * @dev Creates a new snapshot and returns its snapshot id.\r\n     *\r\n     * Emits a {Snapshot} event that contains the same id.\r\n     *\r\n     * {_snapshot} is `internal` and you have to decide how to expose it externally. Its usage may be restricted to a\r\n     * set of accounts, for example using {AccessControl}, or it may be open to the public.\r\n     *\r\n     * [WARNING]\r\n     * ====\r\n     * While an open way of calling {_snapshot} is required for certain trust minimization mechanisms such as forking,\r\n     * you must consider that it can potentially be used by attackers in two ways.\r\n     *\r\n     * First, it can be used to increase the cost of retrieval of values from snapshots, although it will grow\r\n     * logarithmically thus rendering this attack ineffective in the long term. Second, it can be used to target\r\n     * specific accounts and increase the cost of ERC20 transfers for them, in the ways specified in the Gas Costs\r\n     * section above.\r\n     *\r\n     * We haven't measured the actual numbers; if this is something you're interested in please reach out to us.\r\n     * ====\r\n     */\r\n    function _snapshot() internal virtual returns (uint256) {\r\n        _currentSnapshotId.increment();\r\n\r\n        uint256 currentId = _currentSnapshotId.current();\r\n        emit Snapshot(currentId);\r\n        return currentId;\r\n    }\r\n\r\n    /**\r\n     * @dev Retrieves the balance of `account` at the time `snapshotId` was created.\r\n     */\r\n    function balanceOfAt(address account, uint256 snapshotId) public view returns (uint256) {\r\n        (bool snapshotted, uint256 value) = _valueAt(snapshotId, _accountBalanceSnapshots[account]);\r\n\r\n        return snapshotted ? value : balanceOf(account);\r\n    }\r\n\r\n    /**\r\n     * @dev Retrieves the total supply at the time `snapshotId` was created.\r\n     */\r\n    function totalSupplyAt(uint256 snapshotId) public view returns(uint256) {\r\n        (bool snapshotted, uint256 value) = _valueAt(snapshotId, _totalSupplySnapshots);\r\n\r\n        return snapshotted ? value : totalSupply();\r\n    }\r\n\r\n    // _transfer, _mint and _burn are the only functions where the balances are modified, so it is there that the\r\n    // snapshots are updated. Note that the update happens _before_ the balance change, with the pre-modified value.\r\n    // The same is true for the total supply and _mint and _burn.\r\n    function _transfer(address from, address to, uint256 value) internal virtual override {\r\n        _updateAccountSnapshot(from);\r\n        _updateAccountSnapshot(to);\r\n\r\n        super._transfer(from, to, value);\r\n    }\r\n\r\n    function _mint(address account, uint256 value) internal virtual override {\r\n        _updateAccountSnapshot(account);\r\n        _updateTotalSupplySnapshot();\r\n\r\n        super._mint(account, value);\r\n    }\r\n\r\n    function _burn(address account, uint256 value) internal virtual override {\r\n        _updateAccountSnapshot(account);\r\n        _updateTotalSupplySnapshot();\r\n\r\n        super._burn(account, value);\r\n    }\r\n\r\n    function _valueAt(uint256 snapshotId, Snapshots storage snapshots)\r\n        private view returns (bool, uint256)\r\n    {\r\n        require(snapshotId > 0, \"ERC20Snapshot: id is 0\");\r\n        // solhint-disable-next-line max-line-length\r\n        require(snapshotId <= _currentSnapshotId.current(), \"ERC20Snapshot: nonexistent id\");\r\n\r\n        // When a valid snapshot is queried, there are three possibilities:\r\n        //  a) The queried value was not modified after the snapshot was taken. Therefore, a snapshot entry was never\r\n        //  created for this id, and all stored snapshot ids are smaller than the requested one. The value that corresponds\r\n        //  to this id is the current one.\r\n        //  b) The queried value was modified after the snapshot was taken. Therefore, there will be an entry with the\r\n        //  requested id, and its value is the one to return.\r\n        //  c) More snapshots were created after the requested one, and the queried value was later modified. There will be\r\n        //  no entry for the requested id: the value that corresponds to it is that of the smallest snapshot id that is\r\n        //  larger than the requested one.\r\n        //\r\n        // In summary, we need to find an element in an array, returning the index of the smallest value that is larger if\r\n        // it is not found, unless said value doesn't exist (e.g. when all values are smaller). Arrays.findUpperBound does\r\n        // exactly this.\r\n\r\n        uint256 index = snapshots.ids.findUpperBound(snapshotId);\r\n\r\n        if (index == snapshots.ids.length) {\r\n            return (false, 0);\r\n        } else {\r\n            return (true, snapshots.values[index]);\r\n        }\r\n    }\r\n\r\n    function _updateAccountSnapshot(address account) private {\r\n        _updateSnapshot(_accountBalanceSnapshots[account], balanceOf(account));\r\n    }\r\n\r\n    function _updateTotalSupplySnapshot() private {\r\n        _updateSnapshot(_totalSupplySnapshots, totalSupply());\r\n    }\r\n\r\n    function _updateSnapshot(Snapshots storage snapshots, uint256 currentValue) private {\r\n        uint256 currentId = _currentSnapshotId.current();\r\n        if (_lastSnapshotId(snapshots.ids) < currentId) {\r\n            snapshots.ids.push(currentId);\r\n            snapshots.values.push(currentValue);\r\n        }\r\n    }\r\n\r\n    function _lastSnapshotId(uint256[] storage ids) private view returns (uint256) {\r\n        if (ids.length == 0) {\r\n            return 0;\r\n        } else {\r\n            return ids[ids.length - 1];\r\n        }\r\n    }\r\n}\r\n\r\n\r\n// File contracts/BalancerGovernanceToken.sol\r\n\r\npragma solidity =0.6.8;\r\n\r\n\r\n\r\ncontract BalancerGovernanceToken is AccessControl, ERC20Snapshot {\r\n\r\n    string  public constant version  = \"1\";\r\n    bytes32 public constant MINTER_ROLE = keccak256(\"MINTER_ROLE\");\r\n    bytes32 public constant SNAPSHOT_ROLE = keccak256(\"SNAPSHOT_ROLE\");\r\n\r\n    bytes32 public immutable DOMAIN_SEPARATOR;\r\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\");\r\n    bytes32 public immutable PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\r\n    mapping(address => uint) public nonces;\r\n\r\n    constructor(string memory name, string memory symbol) public ERC20(name, symbol) {\r\n        _setupRole(DEFAULT_ADMIN_ROLE, _msgSender());\r\n        _setupRole(MINTER_ROLE, _msgSender());\r\n        _setupRole(SNAPSHOT_ROLE, _msgSender());\r\n\r\n        uint256 chainId = _chainID();\r\n        DOMAIN_SEPARATOR = keccak256(\r\n            abi.encode(\r\n                keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),\r\n                keccak256(bytes(name)),\r\n                keccak256(bytes(version)),\r\n                chainId,\r\n                address(this)\r\n            )\r\n        );\r\n    }\r\n\r\n    function _chainID() private pure returns (uint256) {\r\n        uint256 chainID;\r\n        assembly {\r\n            chainID := chainid()\r\n        }\r\n        return chainID;\r\n    }\r\n\r\n    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {\r\n        require(block.timestamp <= deadline, \"ERR_EXPIRED_SIG\");\r\n        bytes32 digest = keccak256(\r\n            abi.encodePacked(\r\n                uint16(0x1901),\r\n                DOMAIN_SEPARATOR,\r\n                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))\r\n            )\r\n        );\r\n        require(owner == _recover(digest, v, r, s), \"ERR_INVALID_SIG\");\r\n        _approve(owner, spender, value);\r\n    }\r\n\r\n    function _recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) private pure returns (address) {\r\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\r\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\r\n        // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most\r\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\r\n        //\r\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\r\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\r\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\r\n        // these malleable signatures as well.\r\n        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {\r\n            revert(\"ECDSA: invalid signature 's' value\");\r\n        }\r\n\r\n        if (v != 27 && v != 28) {\r\n            revert(\"ECDSA: invalid signature 'v' value\");\r\n        }\r\n\r\n        // If the signature is valid (and not malleable), return the signer address\r\n        address signer = ecrecover(hash, v, r, s);\r\n        require(signer != address(0), \"ECDSA: invalid signature\");\r\n\r\n        return signer;\r\n    }\r\n\r\n    function mint(address to, uint256 amount) public virtual {\r\n        require(hasRole(MINTER_ROLE, _msgSender()), \"ERR_MINTER_ROLE\");\r\n        _mint(to, amount);\r\n    }\r\n\r\n    function burn(uint256 amount) public virtual {\r\n        _burn(_msgSender(), amount);\r\n    }\r\n\r\n    function burnFrom(address account, uint256 amount) public virtual {\r\n        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, \"ERC20: burn amount exceeds allowance\");\r\n\r\n        _approve(account, _msgSender(), decreasedAllowance);\r\n        _burn(account, amount);\r\n    }\r\n\r\n    function snapshot() public virtual {\r\n        require(hasRole(SNAPSHOT_ROLE, _msgSender()), \"ERR_SNAPSHOT_ROLE\");\r\n        _snapshot();\r\n    }\r\n\r\n}"}},"compilation":{"language":"Solidity","compiler":"solc","compilerVersion":"0.6.8+commit.0bbfe453","compilerSettings":{"metadata":{"bytecodeHash":"ipfs"},"libraries":{},"optimizer":{"runs":200,"enabled":false},"evmVersion":"istanbul","remappings":[]},"name":"BalancerGovernanceToken","fullyQualifiedName":"BalancerGovernanceToken.sol:BalancerGovernanceToken"},"runtimeBytecode":{"onchainBytecode":"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