How Can I Customize Memory Management by Overloading Global `new` and `delete` Operators?

Customizing Memory Management by Overloading Global new and delete Operators

When attempting to establish custom memory management by overloading global new and delete operators, it can be challenging to ensure that all code uses them consistently. Here's an effective approach to achieve this:

1. Replace Standard Operators at Link Time:

Contrary to including header files in numerous files, you can replace the standard operators at link time. Create a separate translation unit (TU) like the following:

<code class="cpp">// custom_new_delete.cpp

void * operator new(std::size_t n) throw(std::bad_alloc)
{
  // Custom memory allocation logic...
}

void operator delete(void * p) throw()
{
  // Custom memory deallocation logic...
}</code>

2. Linking and Declaring:

Link this TU into the project. It will define the replaced operators globally. However, it's recommended to include necessary headers like to declare external symbols like std, std::bad_alloc, and std::size_t.

3. C 11 Simplifications:

Using C 11 or later, you can simplify the code as follows:

<code class="cpp">void * operator new(decltype(sizeof(0)) n) noexcept(false)
{
  // Custom memory allocation logic...
}</code>

This eliminates the need for dynamic exception specifications and simplifies the declaration.

By following this approach, you ensure that all code within your project will utilize your custom memory manager without the need for extensive header file inclusion.

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