How can I override the default shared pointer destructor behavior in C ?

Overriding Default Shared Pointer Behavior

In C programming, the boost::shared_ptr class is commonly used for memory management. However, in certain scenarios, you may encounter the need to override the default behavior of shared_ptr's destructor, which calls delete.

One specific requirement is to have shared_ptr invoke a custom deleteMe() member function instead of delete. You may also want to handle the destruction of pointers returned by C-style functions by calling a specific function like lib_freeXYZ().

Solution: Using Functors

To address this requirement, you can utilize STL functors to provide the necessary wrapper functionality. Here's how you can do it:

<code class="cpp">boost::shared_ptr<T> ptr(new T, std::mem_fun_ref(&T::deleteMe));
boost::shared_ptr<S> ptr(new S, std::ptr_fun(lib_freeXYZ));</code>

By employing functors, you can modify the default behavior of shared_ptr's destructor and specify the desired deletion mechanism for both class and C-style function pointers.

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