From 3a2d712d31c6259fb4ef4ecb6dbcccc152e829c7 Mon Sep 17 00:00:00 2001
From: Paul Wells <paulwe@gmail.com>
Date: Tue, 17 Sep 2024 23:03:12 -0700
Subject: [PATCH] add utilities for applying options and copying protobufs

---
 utils/math.go            | 37 ++++++++-----------------------------
 utils/options/options.go | 22 ++++++++++++++++++++++
 utils/proto.go           | 21 +++++++++++++++++++++
 3 files changed, 51 insertions(+), 29 deletions(-)
 create mode 100644 utils/options/options.go
 create mode 100644 utils/proto.go

diff --git a/utils/math.go b/utils/math.go
index 6f663221..02c1d439 100644
--- a/utils/math.go
+++ b/utils/math.go
@@ -14,37 +14,16 @@
 
 package utils
 
-import (
-	"time"
+import "math"
 
-	"golang.org/x/exp/constraints"
-)
-
-type Numeric interface {
-	constraints.Signed | constraints.Unsigned | time.Duration
-}
-
-func Max[T Numeric](vs ...T) T {
-	return Least(func(a, b T) bool { return a > b }, vs...)
-}
-
-func Min[T Numeric](vs ...T) T {
-	return Least(func(a, b T) bool { return a < b }, vs...)
-}
-
-func Most[T Numeric](less func(a, b T) bool, vs ...T) T {
-	return Least(func(a, b T) bool { return !less(a, b) }, vs...)
+func LogisticFunc(x0, L, k float64) func(x float64) float64 {
+	return func(x float64) float64 {
+		return L / (1 + math.Pow(math.E, -k*(x-x0)))
+	}
 }
 
-func Least[T Numeric](less func(a, b T) bool, vs ...T) T {
-	if len(vs) == 0 {
-		return 0
-	}
-	v := vs[0]
-	for i := 1; i < len(vs); i++ {
-		if less(vs[i], v) {
-			v = vs[i]
-		}
+func FastLogisticFunc(x0, L, k float64) func(x float64) float64 {
+	return func(x float64) float64 {
+		return L / 2 * (1 + k*(x-x0)/(1+math.Abs(k*(x-x0))))
 	}
-	return v
 }
diff --git a/utils/options/options.go b/utils/options/options.go
new file mode 100644
index 00000000..b2ef975b
--- /dev/null
+++ b/utils/options/options.go
@@ -0,0 +1,22 @@
+// Copyright 2023 LiveKit, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package options
+
+func Apply[T any, F ~func(T)](o T, opts []F) T {
+	for _, opt := range opts {
+		opt(o)
+	}
+	return o
+}
diff --git a/utils/proto.go b/utils/proto.go
new file mode 100644
index 00000000..61389d00
--- /dev/null
+++ b/utils/proto.go
@@ -0,0 +1,21 @@
+// Copyright 2023 LiveKit, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package utils
+
+import "google.golang.org/protobuf/proto"
+
+func CloneProto[T proto.Message](m T) T {
+	return proto.Clone(m).(T)
+}