#include <new>
#include <iostream>

class Counter {
public:
    void decrement() { --ref_; }

    Counter() : ref_(1) {}

    int ref() const {
        return ref_;
    }

private:
    int ref_;
};

template< typename T >
class Foo {
  public:
    void resetData() {
        ref_.decrement();
        std::cout << "before: " << ref_.ref() << std::endl;
        ref_.~Counter();
        void *refLoc = &ref_;

        // GCC erroneously claims that the following line has no
        // effect.  But it does have an effect: the value of the
        // "after" message will be 0 instead of 1 if you comment it
        // out.
        new ( refLoc ) Counter();

        std::cout << "after: " << ref_.ref() << std::endl;
    }

  private:
    Counter ref_;
};

int main() {
    Foo< int > node;

    node.resetData();
}