44 lines
1.2 KiB
Solidity
44 lines
1.2 KiB
Solidity
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v5.0.0) (utils/math/SignedMath.sol)
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pragma solidity ^0.8.20;
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/**
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* @dev Standard signed math utilities missing in the Solidity language.
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*/
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library SignedMath {
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/**
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* @dev Returns the largest of two signed numbers.
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*/
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function max(int256 a, int256 b) internal pure returns (int256) {
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return a > b ? a : b;
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}
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/**
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* @dev Returns the smallest of two signed numbers.
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*/
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function min(int256 a, int256 b) internal pure returns (int256) {
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return a < b ? a : b;
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}
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/**
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* @dev Returns the average of two signed numbers without overflow.
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* The result is rounded towards zero.
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*/
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function average(int256 a, int256 b) internal pure returns (int256) {
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// Formula from the book "Hacker's Delight"
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int256 x = (a & b) + ((a ^ b) >> 1);
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return x + (int256(uint256(x) >> 255) & (a ^ b));
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}
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/**
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* @dev Returns the absolute unsigned value of a signed value.
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*/
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function abs(int256 n) internal pure returns (uint256) {
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unchecked {
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// must be unchecked in order to support `n = type(int256).min`
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return uint256(n >= 0 ? n : -n);
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}
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}
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}
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