How Can I Customize the Deletion Process of `boost::shared_ptr`?

Custom Deleters for boost::shared_ptr

Query:

In certain scenarios, developers may encounter the need to customize the behavior of boost::shared_ptr's deletion process. Consider the following objectives:

• Override the default delete operator with a custom function ptr->deleteMe().
• Handle C-style function returns that require lib_freeXYZ(ptr) instead of plain delete.

Solution:

Using the Standard Template Library (STL) offers a viable solution to these requirements:

<code class="cpp">// Custom deleter for shared_ptr that invokes ptr->deleteMe()
boost::shared_ptr<T> ptr(new T, std::mem_fun_ref(&T::deleteMe));

// Custom deleter for shared_ptr that invokes lib_freeXYZ(ptr)
boost::shared_ptr<S> ptr(new S, std::ptr_fun(lib_freeXYZ));</code>

This approach allows for the desired customization of the deletion process for both boost::shared_ptr instances.

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