Item 21. An Unmanaged Pointer Problem, Part 2: What About auto_ptr?

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Item 21. An Unmanaged Pointer Problem, Part 2: What About auto_ptr?

Difficulty: 8

Does using auto_ptr help to solve the problem in Item 20?

1. As you continue to root through the archives, you see that someone must not have liked Item 20 Example 20-2 because later versions of the files in question were changed as follows :

    // Example 21-1 // // In some header file: void f( auto_ptr<T1>, auto_ptr<T2> ); // In some implementation file: f( auto_ptr<T1>( new T1 ), auto_ptr<T2>( new T2 ) ); 

   What improvements does this version offer over Item 20 Example 20-2, if any? Do any exception safety problems remain ? Explain.

2. Demonstrate how to write an auto_ptr_new facility that solves the safety problems in Question 1 and can be invoked as follows:

    // Example 21-2 // // In some header file: void f( auto_ptr<T1>, auto_ptr<T2> ); // In some implementation file: f( auto_ptr_new<T1>(), auto_ptr_new<T2>() ); 

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