What is the difference between "new" and "malloc" and "calloc" and others in family?
(When) Do I need anything other than "new" ?
Is one of them implemented using any other?
delete are C++ specific features. They didn't exist in C.
malloc is the old school C way to do things. Most of the time, you won't need to use it in C++.
mallocallocates uninitialized memory. The allocated memory has to be released with
mallocbut initializes the allocated memory with a constant (0). It needs to be freed with
newinitializes the allocated memory by calling the constructor (if it's an object). Memory allocated with
newshould be released with
delete(which in turn calls the destructor). It does not need you to manually specify the size you need and cast it to the appropriate type. Thus, it's more modern and less prone to errors.
new/delete + new/delete:
malloc/free + family:
Also see my related answer here