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Redirect C Delete Operations for Boost Shared Pointers

In C programming, Boost shared pointers commonly use the delete operator to deallocate memory. However, some scenarios may require alternative ways to release memory. This article explores options for modifying the behavior of shared pointers to invoke custom or C-style memory deallocation functions.

Custom Deallocator for Shared Pointers

To divert the shared pointer's delete action to a custom function ptr->deleteMe(), utilize the following approach:

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

By providing the mem_fun_ref as the deleter, the shared_ptr will call deleteMe() instead of delete for the target object.

Redirecting Free Operations for C-Style Functions

For C-style functions that return a pointer, such as lib_freeXYZ(ptr), the ptr_fun can be employed:

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

This approach directs the shared pointer to call lib_freeXYZ() upon destruction of the S-type object.

By implementing these techniques, developers gain greater flexibility in tailoring memory management within their applications, allowing them to integrate custom or C-style memory release functions seamlessly with Boost shared pointers.

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