Header File 

new.h 

Syntax 

typedef void (*pvf)(); 

pvf _new_handler; 

Description 

_new_handler contains a pointer to a function that takes no arguments and returns void. If operator new() is unable to allocate the space required, it will call the function pointed to by _new_handler; if that function returns it will try the allocation again. By default, the function pointed to by _new_handler simply terminates the application. The application can replace this handler, however, with a function that can try to free up some space. This is done by assigning directly to _new_handler or by calling the function set_new_handler, which returns a pointer to the former handler. 

As an alternative, you can set using the function set_new_handler, like this: 

pvf set_new_handler(pvf p); 

_new_handler is provided primarily for compatibility with C++ version 1.2. In most cases this functionality can be better provided by overloading operator new(). 

Example