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1295969 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | // SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity >=0.8.13 <0.9.0;
library stdMath {
int256 private constant INT256_MIN = -57896044618658097711785492504343953926634992332820282019728792003956564819968;
function abs(int256 a) internal pure returns (uint256) {
// Required or it will fail when `a = type(int256).min`
if (a == INT256_MIN) {
return 57896044618658097711785492504343953926634992332820282019728792003956564819968;
}
return uint256(a > 0 ? a : -a);
}
function delta(uint256 a, uint256 b) internal pure returns (uint256) {
return a > b ? a - b : b - a;
}
function delta(int256 a, int256 b) internal pure returns (uint256) {
// a and b are of the same sign
// this works thanks to two's complement, the left-most bit is the sign bit
if ((a ^ b) > -1) {
return delta(abs(a), abs(b));
}
// a and b are of opposite signs
return abs(a) + abs(b);
}
function percentDelta(uint256 a, uint256 b) internal pure returns (uint256) {
// Prevent division by zero
require(b != 0, "stdMath percentDelta(uint256,uint256): Divisor is zero");
uint256 absDelta = delta(a, b);
return absDelta * 1e18 / b;
}
function percentDelta(int256 a, int256 b) internal pure returns (uint256) {
uint256 absDelta = delta(a, b);
uint256 absB = abs(b);
// Prevent division by zero
require(absB != 0, "stdMath percentDelta(int256,int256): Divisor is zero");
return absDelta * 1e18 / absB;
}
}
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