wip: optimize

src/utils.h

@@ -0,0 +1,22 @@
+#ifndef UTILS_H
+#define UTILS_H
+
+#include <utility>
+
+template <typename Callable>
+class Defer {
+    Callable m_func;
+
+  public:
+    explicit Defer(Callable&& func)
+        : m_func(std::forward<Callable>(func)) {}
+
+    Defer()             = delete;
+    Defer(const Defer&) = delete;
+
+    ~Defer() {
+        m_func();
+    }
+};
+
+#endif  // UTILS_H