Moved stuff, added Contains to sliceutils

containers/generics.go

@@ -0,0 +1,34 @@
+package containers
+
+type ChainElem[T any] struct {
+	Elem *T
+	Next *ChainElem[T]
+}
+
+// reachable checks if you can reach elem l when starting from elem f.
+// It detects loops and returns false if it runs into one.
+func reachable[T any](f, l *ChainElem[T]) bool {
+	// Map to keep track of nodes already visited
+	checks := make(map[*ChainElem[T]]bool)
+	for w := f; w != l; w = w.Next {
+		if w == nil {
+			return false
+		}
+		// Shortcut: Maps where the value is bool have a default value of false
+		// If a key doesn't exist yet the result will thus be false
+		if checks[w] {
+			return false
+		}
+		// Set the current elem to true to mark it as visited
+		checks[w] = true
+	}
+	return true
+}
+
+// emptyElem creates a new ChainElem[T] with empty values.
+func emptyElem[T any]() *ChainElem[T] {
+	return &ChainElem[T]{
+		Elem: nil,
+		Next: nil,
+	}
+}