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SafeMath.sol
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SafeMath.sol
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
/**
* SafeMath mul function
* @dev function for safe multiply
**/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a * b;
assert(a == 0 || c / a == b);
return c;
}
/**
* SafeMath div funciotn
* @dev function for safe devide
**/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a / b;
return c;
}
/**
* SafeMath sub function
* @dev function for safe subtraction
**/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
/**
* SafeMath add fuction
* @dev function for safe addition
**/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}