From 1547391126c325348821a73e9f1a529174e53330 Mon Sep 17 00:00:00 2001
From: "sashakoshka@tebibyte.media" <sashakoshka@tebibyte.media>
Date: Tue, 10 Sep 2024 16:47:20 -0400
Subject: [PATCH] Add optional container

---
 container/optional.go | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 container/optional.go

diff --git a/container/optional.go b/container/optional.go
new file mode 100644
index 0000000..8814358
--- /dev/null
+++ b/container/optional.go
@@ -0,0 +1,31 @@
+package ucontainer
+
+// Optional is an optional value.
+type Optional[T any] struct {
+	value T
+	exists bool
+}
+
+// Value returns the value and true if the value exists. If not, it returns the
+// last set value and false.
+func (this *Optional[T]) Value () (T, bool) {
+	return this.value, this.exists
+}
+
+// Set sets the value.
+func (this *Optional[T]) Set (value T) {
+	this.value = value
+	this.exists = true
+}
+
+// Unset unsets the value.
+func (this *Optional[T]) Unset () {
+	var zero T
+	this.value = zero
+	this.exists = false
+}
+
+// Exists returns if the value is currently set.
+func (this *Optional[T]) Exists () bool {
+	return this.exists
+}