#include <iostream>
#include <fstream>

using namespace std;

class file {
private:
    fstream data_file;
public:
    file (const char* filename) {
        data_file.open(filename);
        if (!data_file.is_open()) {
            throw("file open failure");
        }
    }

    ~file() {

        if (!data_file.is_open()) {
            cout << "Destructor was called after throwing an error in the constructor";
        }
        else {
            cout << "Destructor was called";
        }
    }
};

int main() {
    file file1("asd");
    return 0;
}