Converting objects of classes

Blase · #1 09-Sep-2007, 21:30

Hi,

"Explain why it is essential that a class that dynamically allocate memory in the constructor also needs a properly written copy constructor and assignment operator."

Is the above question related to memory leaks? How would we know if we have 'improperly' written the copy constructor and assignment operator? What are the pre-emptive measures?

"What are the two ways of achieving automatic type conversion from an object of class X into an object of class Y?"

#2 11-Sep-2007, 06:50

Quote:

Originally Posted by Blase

Hi,

"Explain why it is essential that a class that dynamically allocate memory in the constructor also needs a properly written copy constructor and assignment operator."

Is the above question related to memory leaks? How would we know if we have 'improperly' written the copy constructor and assignment operator? What are the pre-emptive measures?

See: www.gidforums.com

...for more details.

Quote:

Originally Posted by Blase

"What are the two ways of achieving automatic type conversion from an object of class X into an object of class Y?"

Using a derived where a base is required and assignment/copy of a base from a derived?

CPP / C++ / C Code:

#include <iostream>

using namespace std;

class X
{
public:
    void what()
    {
        cout << "X" << endl;
    }
};

class Y : public X
{
public:
    void what()
    {
        cout << "Y" << endl;
    }
};

void bogus( X& x )
{
    x.what();
}

int main()
{
    X x;
    Y y;
    bogus( y );
    x = y;
    x.what();
}

Output:

Code:

X
X

:davis:

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Rate This Thread
Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Problem accessing functions in inherited classes	jj90	C++ Forum	4	14-May-2007 14:12
Beginner working with classes	Timothy_Bennett	C++ Forum	14	05-Apr-2007 22:22
a quick question about using classes, objects and their properties...	abakws	MySQL / PHP Forum	1	20-Nov-2006 09:31

Converting objects of classes

Re: Converting objects of classes