✨ wadPow

transmissions11 · transmissions11 · commit 3a752b8c8342 · 2022-11-30T16:18:23.000-08:00
diff --git a/src/utils/SignedWadMath.sol b/src/utils/SignedWadMath.sol
@@ -87,6 +87,12 @@ function wadDiv(int256 x, int256 y) pure returns (int256 r) {
     }
 }
 
+/// @dev Will not work with negative bases, only use when x is positive.
+function wadPow(int256 x, int256 y) pure returns (int256) {
+    // Equivalent to x to the power of y because x ** y = (e ** ln(x)) ** y = e ** (ln(x) * y)
+    return wadExp((wadLn(x) * y) / 1e18); // Using ln(x) means x must be greater than 0.
+}
+
 function wadExp(int256 x) pure returns (int256 r) {
     unchecked {
         // When the result is < 0.5 we return zero. This happens when

Original file line number	Diff line number	Diff line change
`@@ -87,6 +87,12 @@ function wadDiv(int256 x, int256 y) pure returns (int256 r) {`
`87`	`87`	`}`
`88`	`88`	`}`
`89`	`89`
	`90`	`+/// @dev Will not work with negative bases, only use when x is positive.`
	`91`	`+function wadPow(int256 x, int256 y) pure returns (int256) {`
	`92`	`+ // Equivalent to x to the power of y because x y = (e ln(x)) y = e (ln(x) * y)`
	`93`	`+ return wadExp((wadLn(x) * y) / 1e18); // Using ln(x) means x must be greater than 0.`
	`94`	`+}`
	`95`	`+`
`90`	`96`	`function wadExp(int256 x) pure returns (int256 r) {`
`91`	`97`	`unchecked {`
`92`	`98`	`// When the result is < 0.5 we return zero. This happens when`