Initial Course

modules/06_oop_basics/include/polymorphism.hpp

@@ -0,0 +1,30 @@
+#pragma once
+
+#include "inheritance.hpp"
+
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace oop {
+
+[[nodiscard]] auto total_area(const std::vector<std::unique_ptr<Shape>>& shapes) -> double;
+[[nodiscard]] auto shape_names(const std::vector<std::unique_ptr<Shape>>& shapes)
+    -> std::vector<std::string>;
+
+class Counter {
+public:
+    Counter() = default;
+    Counter(const Counter&) { ++copies_; }
+    auto operator=(const Counter&) -> Counter& {
+        ++copies_;
+        return *this;
+    }
+
+    [[nodiscard]] static auto copies() -> int;
+
+private:
+    inline static int copies_ = 0;
+};
+
+}  // namespace oop