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?
new
and 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++.
malloc
allocates uninitialized memory. The allocated memory has to be released with free
.calloc
is like malloc
but initializes the allocated memory with a constant (0). It needs to be freed with free
.new
initializes the allocated memory by calling the constructor (if it's an object). Memory allocated with new
should 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.