Friday, December 3, 2010

customize new/malloc, briefly

For a given class C with a derived class D,

C::operator new(......); // is inheritable by D; implicit static; allocates raw memory
C::operator delete(...); // is inheritable by D; implicit static; deallocates raw memory i.e. return to the "pool"

C(........); // never inherited; never static; turns allocated raw memory into object
~C(void); // never inherited; never static; turns object into raw memory, to be deallocated.

All of them can be private.

As explained in another blog post, the new expression like "new D()" can't be overloaded. This expression invokes the operator new and the ctor.

[[effC++]] has a lengthy chapter on how to customize new/delete.

P139 [[understanding and using c pointers]] has a short chapter on how to avoid the overhead of frequent malloc/free operations. Note this is NOT replacing malloc with our own malloc.

P70 [[understanding and using c pointers]] has a one-pager super-simple wrapper over free()

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