snapshot of https://github.com/grpc/grpc-go.git (master, 2026-09-15; blobs > 131072B omitted)

internal/optional/optional.go

@@ -0,0 +1,47 @@
+/*
+ *
+ * Copyright 2026 gRPC authors.
+ *
+ * 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 optional implements a generic optional type.
+package optional
+
+// Optional represents an optional value of type T. The zero value is usable and
+// indicates that no value is set. This type is not safe for concurrent access.
+type Optional[T any] struct {
+	val T
+	set bool
+}
+
+// New creates a new Optional type with the provided value.
+func New[T any](value T) Optional[T] {
+	return Optional[T]{
+		val: value,
+		set: true,
+	}
+}
+
+// Value returns the underlying value and a boolean indicating if the value is
+// set. If the value is not set, it returns the zero value of T and false.
+func (o *Optional[T]) Value() (T, bool) {
+	return o.val, o.set
+}
+
+// SetValue updates or adds the value to Optional.
+func (o *Optional[T]) SetValue(v T) {
+	o.val = v
+	o.set = true
+}