Update 007_any_bad_any_cast.cpp

Author: ls-Brynn

cpp_17/007_any_bad_any_cast.cpp

@@ -1 +1,16 @@
-1
+#include <iostream>
+#include <typeinfo>
+ 
+struct Foo { virtual ~Foo() {} };
+struct Bar { virtual ~Bar() {} };
+ 
+int main()
+{
+    Bar b;
+    try {
+        Foo& f = dynamic_cast<Foo&>(b);
+    } catch(const std::bad_cast& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}