What happens to base class destructor if a derived class destructor throws an exception

Question

It just happened to me I wondered how resources are freed in the following case.

class Base {
  Resource *r;

public:
  Base() { /* ... */ }
  ~Base() {
             


        

Answer 1

The base class destructor is indeed called. Sample code:

#include 
#include 

class Base {
public:
  Base() { /* ... */ }
  ~Base() {
    printf("Base\n");
  }
};

class Derived : public Base {
public:
  Derived() { /* ... */ }
  ~Derived() {
    printf("Derived\n");
    throw 1;
  }
};

int main() {
  try {
    Derived d;
  } catch(...) {
    printf("CAUGHT!\n");
  }
}

This prints:

Derived
Base
CAUGHT!