close

 

Inheritance constructor & destructor :

 

 #1. Constructor

 


#include <iostream>
using namespace std;
 
class base {
public:
    base(int x, int y) { this->x = x, this->y = y; }
    ~base() {}
    int x;
    int y;
};
 
class basePlus : public base {
public:  
    basePlus(int x, int y, int z) : base(x, y) { this->z = z; }
    ~basePlus() {}
    int z;
};
 
int main() {
 
    basePlus* bp = new basePlus(1,2,3);
    cout << "x : " << bp->x << "\n";
    cout << "y : " << bp->y << "\n";
    cout << "z : " << bp->z << "\n";

    delete bp;
    return 0;
}

 

Output

x : 1
y : 2
z : 3

 

#2. Destructor

 

　　(a) without virtual

 


#include <iostream>
using namespace std;
 
class base {
public:
    base(int x, int y) { this->x = x, this->y = y; }
    ~base() { cout << "base destructor\n"; }
    int x;
    int y;
};
 
class basePlus : public base {
public:  
    basePlus(int x, int y, int z) : base(x, y) { this->z = z; }
    ~basePlus() { cout << "basePlus destructor\n"; }
    int z;
};
 
int main() {
 
    basePlus* bp = new basePlus(1,2,3);
    base* b = bp;
    delete b;
    return 0;
}

 

Output

base destructor

 

　　(b) with virtual

 


#include <iostream>
using namespace std;
 
class base {
public:
    base(int x, int y) { this->x = x, this->y = y; }
    virtual ~base() { cout << "base destructor\n"; }
    int x;
    int y;
};
 
class basePlus : public base {
public:  
    basePlus(int x, int y, int z) : base(x, y) { this->z = z; }
    ~basePlus() { cout << "basePlus destructor\n"; }
    int z;
};
 
int main() {
 
    basePlus* bp = new basePlus(1,2,3);
    base* b = bp;
    delete b;
    return 0;
}

 

Output

basePlus destructor
base destructor

 

 

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