swapped old-school new -> delete to fancy std::unique_ptr

Function.hpp

@@ -1,3 +1,7 @@
+#include <memory>
+
+
+
 template <typename Fun>
 class Function;
 
@@ -28,14 +32,15 @@ private:
         virtual ~callable() override {}
     };
 
-    callable_base* _fun;
+    std::unique_ptr _fun;
+
 public:
     Function() {}
 
     template <typename Fun>
     Function& operator=(Fun fun)
     {
-        _fun = new callable<Fun>(fun);
+        _fun = std::make_unique<callable<Fun>>(fun);
         return *this;
     }
 
@@ -44,6 +49,4 @@ public:
 
     operator bool() const
     { return static_cast<bool>(_fun); }
-
-    ~Function() { delete _fun; }
 };