when to call auto_ptr release?

  • Thread starter Thread starter George3
  • Start date Start date
G

George3

Hello everyone,


Auto_ptr is convenient because of it saves our work and provides a
framework to auto-management life cycle to reduce potential resource
leak.

But why do we sometimes need to call release method on auto_ptr to go
back to the style of manual management? Remember, when we call release,
we need to delete the object instance manually later.

(here is a sample I modified from MSDN auto_ptr sample code)


Code:
--------------------

// auto_ptr_release.cpp
// compile with: /EHsc
#include <memory>
#include <iostream>
#include <vector>
using namespace std;

class Int
{
public:
Int( int i )
{
x = i;
cout << "Constructing " << ( void* )this << " Value: " << x << endl;
};
~Int( ) {
cout << "Destructing " << ( void* )this << " Value: " << x << endl;
};

int x;

};

int main( )
{
auto_ptr<Int> pi ( new Int( 5 ) );
Int* pi3 = pi.release ();
delete pi3;
}

--------------------



thanks in advance,
George
 
George3 said:
Hello everyone,


Auto_ptr is convenient because of it saves our work and provides a
framework to auto-management life cycle to reduce potential resource
leak.

But why do we sometimes need to call release method on auto_ptr to go
back to the style of manual management? Remember, when we call
release, we need to delete the object instance manually later.

(here is a sample I modified from MSDN auto_ptr sample code)


Code:
--------------------

// auto_ptr_release.cpp
// compile with: /EHsc
#include <memory>
#include <iostream>
#include <vector>
using namespace std;

class Int
{
public:
Int( int i )
{
x = i;
cout << "Constructing " << ( void* )this << " Value: " << x << endl;
};
~Int( ) {
cout << "Destructing " << ( void* )this << " Value: " << x << endl;
};

int x;

};

int main( )
{
auto_ptr<Int> pi ( new Int( 5 ) );
Int* pi3 = pi.release ();
delete pi3;
}

--------------------



thanks in advance,
George
Click to expand...

Again with multiposting... It seems that you can understand the wide range
topic answers that people give you, but you are unable to understand a simple
concept.. multiposting.. The question is: Are you testing our patience? FYI,
http://www.blakjak.demon.co.uk/mul_crss.htm
 
Back
Top