79 lines
1.9 KiB
Solidity
79 lines
1.9 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.0;
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/**
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* @dev Wrappers over Solidity's arithmetic operations.
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*/
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library SafeMath {
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/**
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* @dev Returns the addition of two unsigned integers, reverting on
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* overflow.
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*
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* Counterpart to Solidity's `+` operator.
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*
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* Requirements:
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*
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* - Addition cannot overflow.
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*/
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function add(uint256 a, uint256 b) internal pure returns (uint256) {
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return a + b;
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}
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/**
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* @dev Returns the subtraction of two unsigned integers, reverting on
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* overflow (when the result is negative).
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*
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* Counterpart to Solidity's `-` operator.
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*
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* Requirements:
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*
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* - Subtraction cannot overflow.
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*/
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function sub(uint256 a, uint256 b) internal pure returns (uint256) {
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return a - b;
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}
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/**
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* @dev Returns the multiplication of two unsigned integers, reverting on
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* overflow.
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*
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* Counterpart to Solidity's `*` operator.
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*
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* Requirements:
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*
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* - Multiplication cannot overflow.
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*/
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function mul(uint256 a, uint256 b) internal pure returns (uint256) {
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return a * b;
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}
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/**
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* @dev Returns the integer division of two unsigned integers. Reverts on
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* division by zero. The result is rounded towards zero.
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*
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* Counterpart to Solidity's `/` operator.
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*
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* Requirements:
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*
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* - The divisor cannot be zero.
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*/
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function div(uint256 a, uint256 b) internal pure returns (uint256) {
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return a / b;
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}
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/**
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* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
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* Reverts when dividing by zero.
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*
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* Counterpart to Solidity's `%` operator.
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*
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* Requirements:
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*
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* - The divisor cannot be zero.
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*/
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function mod(uint256 a, uint256 b) internal pure returns (uint256) {
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return a % b;
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}
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}
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