34 lines
967 B
Solidity
34 lines
967 B
Solidity
// SPDX-License-Identifier: MIT
|
|
// OpenZeppelin Contracts (last updated v4.5.0-rc.0) (utils/math/SignedMath.sol)
|
|
|
|
pragma solidity ^0.8.0;
|
|
|
|
/**
|
|
* @dev Standard signed math utilities missing in the Solidity language.
|
|
*/
|
|
library SignedMath {
|
|
/**
|
|
* @dev Returns the largest of two signed numbers.
|
|
*/
|
|
function max(int256 a, int256 b) internal pure returns (int256) {
|
|
return a >= b ? a : b;
|
|
}
|
|
|
|
/**
|
|
* @dev Returns the smallest of two signed numbers.
|
|
*/
|
|
function min(int256 a, int256 b) internal pure returns (int256) {
|
|
return a < b ? a : b;
|
|
}
|
|
|
|
/**
|
|
* @dev Returns the average of two signed numbers without overflow.
|
|
* The result is rounded towards zero.
|
|
*/
|
|
function average(int256 a, int256 b) internal pure returns (int256) {
|
|
// Formula from the book "Hacker's Delight"
|
|
int256 x = (a & b) + ((a ^ b) >> 1);
|
|
return x + (int256(uint256(x) >> 255) & (a ^ b));
|
|
}
|
|
}
|