feat: osijvrsoi

pkg/tools/list/main.go

@@ -0,0 +1,57 @@
+package tools
+
+type Node[T any] struct {
+	value  T
+	before *Node[T]
+	after  *Node[T]
+}
+
+type List[T any] struct {
+	front *Node[T]
+	back  *Node[T]
+	size  uint
+}
+
+func New[T any]() List[T] {
+	return List[T]{nil, nil, 0}
+}
+
+func (l *List[T]) PushFront(t T) {
+	item := &Node[T]{t, nil, nil}
+
+	if l.back == nil {
+		l.back = item
+	}
+
+	if front := l.front; front != nil {
+		front.before, item.after = item, front
+	}
+
+	l.size++
+	l.front = item
+}
+
+func (l *List[T]) PopBack() (result T, good bool) {
+	if l.back == nil {
+		return
+	}
+
+	result = l.back.value
+	good = true
+
+	if l.front == l.back {
+		l.front = nil
+	}
+
+	if before := l.back.before; before != nil {
+		before.after = nil
+	}
+
+	l.size--
+	l.back = l.back.before
+	return
+}
+
+func (l *List[T]) Size() uint {
+	return l.size
+}