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require(is_safe_to_add(_x, _y) == true);\n _;\n }\n\n modifier if_safe_to_subtract(uint256 _x, uint256 _y) {\n require(is_safe_to_subtract(_x, _y) == true);\n _;\n }*/\n\n /*uint256 constant ONE_DAY = 1 days;*/\n\n /// DEPRECATED\n /// @notice Call with two integers to determine if they are safe to add\n /// @dev Catches integer overflow\n /// param _a Integer to add\n /// param _b Integer to add\n /// @return _issafe True if the integers are safe to add\n /*function is_safe_to_add(uint256 _a, uint256 _b)\n public\n constant\n returns (bool _is_safe)\n {\n _is_safe = (_a + _b >= _a);\n return _is_safe;\n }*/\n\n /// @notice Returns sum of two safely-added integers\n /// @dev Uses `safeToAdd` internally; throws if unsafe\n /// @param _a Integer to add\n /// @param _b Integer to add\n /// @return _result Sum of inputs\n function add(uint256 _a, uint256 _b)\n public\n pure\n returns (uint256 _result)\n {\n _result = _a + _b;\n require(_result > _a);\n }\n\n /// DEPRECATED\n /// @notice Call with two integers to determine if they are safe to subtract\n /// @dev Catches integer overflow\n /// param _a Integer to subtract from\n /// param _b Integer to subtract\n /// @return _issafe True if the integers are safe to subtract\n /*function is_safe_to_subtract(uint256 _a, uint256 _b)\n public\n constant\n returns (bool _is_safe)\n {\n _is_safe = (_b <= _a);\n return _is_safe;\n }*/\n\n /// @notice Returns result of two safely-subtracted integers\n /// @dev Uses `safeToSubtract` internally; throws if unsafe\n /// @param _a Integer to subtract from\n /// @param _b Integer to subtract\n /// @return _result Result of subtraction\n function subtract(uint256 _a, uint256 _b)\n public\n pure\n returns (uint _result)\n {\n require(_a >= _b);\n _result = _a - _b;\n }\n\n /// DEPRECATED\n ///# @notice Calculates the rate of ???\n ///# @dev `((_unit * _a) + _b / 2) / _b`\n ///# paramm _a ??\n ///# paramm _b ??\n ///# paramm _places Number of decimal places\n ///# @return _result Result of subtraction\n /*function rate_of(uint256 _a, uint256 _b, uint256 _places)\n public\n constant\n returns (uint256 _result)\n {\n var _unit = 10 ** _places;\n _result = add((_unit * _a), (_b / 2)) / _b;\n return _result;\n }*/\n\n /// DEPRECATED\n ///# @notice Calculates the rate from ???\n ///# @dev `(_amount * _baserate) / (10 ** _places)`\n ///# paramm _amount ??\n ///# paramm _baserate ??\n ///# paramm _places ??\n ///# @return _fee Calculated Fee\n /*function from_rate(uint256 _amount, uint256 _baserate, uint256 _places)\n returns (uint256 _fee)\n {\n _fee = ((_amount * _baserate) / (10 ** _places));\n return _fee;\n }*/\n\n /// DEPRECATED\n ///# @notice Calculate demurrage time values\n ///# paramm _current_time Current block time\n ///# paramm _last_payment_date Last demurrage payment date\n ///# @return {\n /// \"_next_payment_date\": \"Next payment date as unix time\",\n /// \"_demurrage_days\": \"Demurrage days calculated\"\n /// }\n /*function calculate_demurrage_time(uint256 _current_time, uint256 _last_payment_date)\n returns (uint256 _next_payment_date, uint256 _demurrage_days)\n {\n var _time_difference = subtract(_current_time, _last_payment_date);\n _demurrage_days = _time_difference / (1 days);\n var _remainder = _time_difference % (1 days);\n var _demurrage_seconds = _demurrage_days * (1 days);\n _next_payment_date = subtract(add(_last_payment_date, _demurrage_seconds), _remainder);\n return (_next_payment_date, _demurrage_days);\n }*/\n\n /// DEPRECATED\n ///# @notice Calculate demurrage fee\n ///# paramm _demurrage_days Days since last demurrage payment\n ///# paramm _unit_size Minimum amount for demurrage fees\n ///# paramm _fee_per_unit Amount of daily demurrage to deduct for every `_demurrage_minimum`\n ///# paramm _raw_balance Account balance\n ///# @return _demurrage_fee The demurrage fee due\n /*function calculate_demurrage_fee(uint256 _demurrage_days, uint256 _unit_size, uint256 _fee_per_unit, uint256 _raw_balance)\n returns (uint256 _demurrage_fee)\n {\n if (_demurrage_days == 0) {\n _demurrage_fee = 0;\n } else {\n var _billable_amount = (_raw_balance / _unit_size);\n _demurrage_fee = (_billable_amount * _demurrage_days * _fee_per_unit);\n }\n return _demurrage_fee;\n }*/\n\n /// DEPRECATED\n ///# @notice Get demurrage info\n ///# paramm _current_time Current block time\n ///# paramm _last_payment_date Last demurrage payment date\n ///# paramm _raw_balance Account balance\n ///# paramm _unit_size Minimum amount needed to charge demurrage fees\n ///# paramm _fee_per_unit The amount of daily demurrage deduct for every `_minimum_for_demurrage`\n /// @return {\n /// \"_demurrage_fee\": \"Fee charged against current balance\",\n /// \"_demurrage_days\": \"Demurrage days calculated\",\n /// \"_billable_amount\": \"Amount eligible for demurrage calculation\",\n /// \"_next_payment_date\": \"Timestamp to use for next payment date\"\n /// }\n /*function get_demurrage_info(uint256 _current_time, uint256 _last_payment_date, uint256 _raw_balance, uint256 _unit_size, uint256 _fee_per_unit)\n returns (uint256 _demurrage_fee, uint256 _demurrage_days, uint256 _balance_after, uint256 _next_payment_date)\n {\n _demurrage_days = (subtract(_current_time, _last_payment_date)) / ONE_DAY;\n uint256 _billable_amount = (_raw_balance / _unit_size);\n if (_demurrage_days == 0) {\n _demurrage_fee = 0;\n _next_payment_date = _last_payment_date;\n _balance_after = _raw_balance;\n } else {\n _demurrage_fee = (_billable_amount * _demurrage_days * _fee_per_unit);\n var _remainder = subtract(_current_time, _last_payment_date) % ONE_DAY;\n _next_payment_date = subtract(add(_last_payment_date, (_demurrage_days * ONE_DAY)), _remainder);\n _balance_after = subtract(_raw_balance, _demurrage_fee);\n }\n return (_demurrage_fee, _demurrage_days, _balance_after, _next_payment_date);\n }*/\n\n /// DEPRECATED\n ///# @notice Calculate Transaction Fee\n ///# paramm _sending_amount The amount being sent\n ///# paramm _unit_size The minimum amount that can be sent\n ///# paramm _fee_per_unit The fee per unit\n ///# @return _tx_fee The transaction fee due\n /*function get_tx_fee(uint256 _sending_amount, uint256 _unit_size, uint256 _fee_per_unit)\n returns (uint256 _tx_fee)\n {\n _tx_fee = (_sending_amount / _unit_size) * _fee_per_unit;\n return _tx_fee;\n }*/\n\n function calculate_recast_fee(uint256 _asset_weight, uint256 _unit_size, uint256 _fee_per_unit)\n public\n pure\n returns (uint256 _recast_fee)\n {\n uint256 _weight_times_fee_per_unit = _asset_weight * _fee_per_unit;\n require(_weight_times_fee_per_unit / _asset_weight == _fee_per_unit);\n _recast_fee = _weight_times_fee_per_unit / _unit_size;\n return _recast_fee;\n }\n\n}\n", "sourcePath": "@digix/solidity-core-libraries/contracts/MathUtils.sol", "ast": { "absolutePath": "@digix/solidity-core-libraries/contracts/MathUtils.sol", "exportedSymbols": { "MathUtils": [ 25197 ] }, "id": 25198, "nodeType": "SourceUnit", 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