mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-21 14:44:00 +00:00
21 lines
522 B
Go
21 lines
522 B
Go
|
package slicesutil
|
||
|
|
|
||
|
|
import "math/bits"
|
||
|
|
|
||
|
|
// ResizeNoCopyMayOverallocate resizes dst to minimum n bytes and returns the resized buffer (which may be newly allocated).
|
||
|
|
//
|
||
|
|
// If newly allocated buffer is returned then b contents isn't copied to it.
|
||
|
|
func ResizeNoCopyMayOverallocate[T any](dst []T, n int) []T {
|
||
|
|
if n <= cap(dst) {
|
||
|
|
return dst[:n]
|
||
|
|
}
|
||
|
|
nNew := roundToNearestPow2(n)
|
||
|
|
dstNew := make([]T, nNew)
|
||
|
|
return dstNew[:n]
|
||
|
|
}
|
||
|
|
|
||
|
|
func roundToNearestPow2(n int) int {
|
||
|
|
pow2 := uint8(bits.Len(uint(n - 1)))
|
||
|
|
return 1 << pow2
|
||
|
|
}
|