Doubt in using 'new' operator

[mthread]

Hi,
I have a doubt about the use of 'new' operator. What happens
when
a 'new' call fails. Does it return a NULL value or does it throw any
exception. I am a C programmer and just starting to learn C++.
Kindly
let me know any resource(link or book) where I can get more
information for my doubt.

 

[Triple-DES]

Hi,
I have a doubt about the use of 'new' operator. What happens
when
a 'new' call fails. Does it return a NULL value or does it throw any
exception. I am a C programmer and just starting to learn C++.
Kindly
let me know any resource(link or book) where I can get more
information for my doubt.

The regular operator new will throw an std::bad_alloc exception upon
failure. But there's also a nothrow version that returns 0 upon
failure.

int * p = new int; // may throw std::bad_alloc

#include <new>
int * q = new(nothrow) int; // may return 0

I believe most C++ textbooks cover this.