example4_defaulted_constructor.cpp

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#include <iostream>
#include <memory>

class Resource {
public:
    Resource() { std::cout << "Resource acquired" << std::endl; }
    ~Resource() { std::cout << "Resource released" << std::endl; }
};

class Manager {
public:
    Manager() : resource_(std::make_unique<Resource>()) {}
    
    // Defaulted destructor
    ~Manager() = default;

private:
    std::unique_ptr<Resource> resource_;
};

int main() {
    {
        Manager m;
        std::cout << "Manager object created" << std::endl;
    }  // Manager and Resource destructors called here
    
    std::cout << "End of main" << std::endl;
    return 0;
}