1 files changed, 35 insertions, 0 deletions
diff --git a/internal/lru/add.go b/internal/lru/add.go
new file mode 100644
index 00000000..6c055ab5
--- /dev/null
+++ b/internal/lru/add.go
@@ -0,0 +1,35 @@
+package lru
+
+// Add inserts or replaces key and marks it most-recently-used.
+//
+// Add returns false when the entry's weight exceeds MaxWeight even for an empty
+// cache. In that case the cache is unchanged.
+//
+// Add panics if weightFn returns a negative weight.
+func (cache *Cache[K, V]) Add(key K, value V) bool {
+	w := cache.weightFn(key, value)
+	if w < 0 {
+		panic("lru: negative entry weight")
+	}
+
+	if w > cache.maxWeight {
+		return false
+	}
+
+	if elem, ok := cache.items[key]; ok {
+		cache.removeElem(elem)
+	}
+
+	ent := &entry[K, V]{
+		key:    key,
+		value:  value,
+		weight: w,
+	}
+	elem := cache.lru.PushBack(ent)
+	cache.items[key] = elem
+	cache.weight += w
+
+	cache.evictOverBudget()
+
+	return true
+}