C++ member destructor

main.cpp

// Example program
#include <iostream>
#include <memory>
#include <string>

using std::cout;
using std::endl;
using std::make_unique;
using std::unique_ptr;

class Inner {
public:
    ~Inner() {
        cout << "~Inner()" << endl;
    }
};

class Outer {
private:
    Inner inner;
    
public:
    unique_ptr<Inner> innerPtr;
    
    Outer(): innerPtr(make_unique<Inner>()) {}

    ~Outer() {
        cout << "~Outer()" << endl;
    }
};

int main() {
    Outer outer;
    std::cout << (outer.innerPtr.get() != nullptr) << std::endl;
}