demo explicit need of calling copy ctorHEADmaster

1 files changed, 40 insertions, 0 deletions

diff --git a/virtual_destructor.cpp b/virtual_destructor.cpp
new file mode 100644
index 0000000..75324c6
--- /dev/null
+++ b/virtual_destructor.cpp
@@ -0,0 +1,40 @@
+/* outputs:
+ *
+ * derived destructor called
+ * base destructor called
+ */
+
+#include <iostream>
+
+/* will generate a class's default ctor, copy ctor, copy assignment operator,
+ * by default data member and dtor are private, default ctor, copy ctor and
+ * assignment operator are public
+ */
+class Base
+{
+  public:
+    virtual ~Base();
+};
+Base::~Base() {
+    std::cout << "base destructor called\n";
+}
+
+class Derived : public Base
+{
+  public:
+    ~Derived();
+};
+Derived::~Derived() {
+    std::cout << "derived destructor called\n";
+}
+
+int main(int argc, char **argv)
+{
+    /* when d goes out of scope, it will call its destructor will call base
+     * class destructor
+     */
+    Derived d;
+    Base b = d; /* conversion of d into Base takes place on rhs, d is sliced down */
+
+    return 0;
+}