66 lines
1.5 KiB
Solidity
66 lines
1.5 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.0;
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/**
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* @title SignedSafeMath
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* @dev Signed math operations that revert on error.
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*/
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library SignedSafeMath {
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/**
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* @dev Returns the multiplication of two signed 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(int256 a, int256 b) internal pure returns (int256) {
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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 signed 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(int256 a, int256 b) internal pure returns (int256) {
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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 signed 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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* - Subtraction cannot overflow.
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*/
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function sub(int256 a, int256 b) internal pure returns (int256) {
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return a - b;
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}
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/**
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* @dev Returns the addition of two signed 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(int256 a, int256 b) internal pure returns (int256) {
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return a + b;
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}
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}
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