SafeMath

Git Source

Submitted for verification at Etherscan.io on 2021-04-14

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.

Functions

add

*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);

sub

*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);

sub

*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);

mul

*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);

div

*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);

div

*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);

mod

*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);

mod

*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);

sqrrt

function sqrrt(uint256 a) internal pure returns (uint256 c);

percentageAmount

function percentageAmount(uint256 total_, uint8 percentage_) internal pure returns (uint256 percentAmount_);

substractPercentage

function substractPercentage(uint256 total_, uint8 percentageToSub_) internal pure returns (uint256 result_);

percentageOfTotal

function percentageOfTotal(uint256 part_, uint256 total_) internal pure returns (uint256 percent_);

average

Taken from Hypersonic https://github.com/M2629/HyperSonic/blob/main/Math.sol

Returns the average of two numbers. The result is rounded towards zero.

function average(uint256 a, uint256 b) internal pure returns (uint256);

quadraticPricing

function quadraticPricing(uint256 payment_, uint256 multiplier_) internal pure returns (uint256);

bondingCurve

function bondingCurve(uint256 supply_, uint256 multiplier_) internal pure returns (uint256);