How do I call the original “operator new” if I have overloaded it?

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You can’t access them because it isn’t really overloading, it’s replacement. When you define your own ::operator new, the old one goes away. That’s pretty much that.

Essentially, you need to call malloc from a custom ::operator new. Not only that, but also follow the directions in 18.4.1.1/4 to properly handle errors:

Default behavior:

— Executes a loop:
Within the loop, the function first
attempts to allocate the requested
storage. Whether the attempt involves
a call to the Standard C library
function malloc is unspecified.

—
Returns a pointer to the allocated
storage if the attempt is successful.
Otherwise, if the last argument to
set_new_handler() was a null pointer,
throw bad_alloc.

— Otherwise, the
function calls the current new_handler
(18.4.2.2). If the called function
returns, the loop repeats.

— The loop
terminates when an attempt to allocate
the requested storage is successful or
when a called new_handler function
does not return.

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