mirror of
https://github.com/livekit/livekit.git
synced 2026-09-04 17:05:14 +00:00
Sanjay P
c88fd2b4d7
* utils: make Median generic, overflow-safe, and add comprehensive * tests: fix staticcheck unused variable warning in changenotifier_test.go * tests: switch from assert to require for consistency with existing tests * trigger ci rerun
70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
// Copyright 2023 LiveKit, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package utils
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import (
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"cmp"
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"slices"
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)
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// OrderedNumber defines a constraint for numeric types that can be ordered and divided.
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type OrderedNumber interface {
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cmp.Ordered
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~int | ~int8 | ~int16 | ~int32 | ~int64 |
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~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 |
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~uintptr | ~float32 | ~float64
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}
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// Median gets the median value for a slice without modifying the original slice.
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//
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// Note:
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// 1. For integer types, if the slice has an even length, the division (/ 2)
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// is performed using integer division, which truncates the result towards zero.
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// 2. Uses an overflow-safe formula left + (right-left)/2 to support narrow integer types.
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func Median[T OrderedNumber](input []T) T {
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num := len(input)
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switch num {
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case 0:
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var zero T
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return zero
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case 1:
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return input[0]
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}
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// Clone the slice to avoid mutating the caller's slice
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sortedInput := slices.Clone(input)
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slices.Sort(sortedInput)
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if num%2 != 0 {
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return sortedInput[num/2]
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}
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left := sortedInput[num/2-1]
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right := sortedInput[num/2]
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return left + (right-left)/T(2)
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}
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func Signum[T int | int8 | int16 | int32 | int64 | float32 | float64](val T) int {
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switch {
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case val < 0:
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return -1
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case val > 0:
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return 1
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default:
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return 0
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}
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}
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