Item 49: Understand the behavior of the new-handler(Effective C++)

set_new_handler allows you to specify a function to be called when memory allocation requests cannot be satisfied.
   Nothrow new is of limited utility, because it applies only to memory allocation; subsequent constructor calls may still throw exceptions.

 1 #include <iostream>
 2 using namespace std;
 3 
 4 class Foo
 5 {
 6 public:
 7     Foo(){}
 8     static new_handler set_new_handler(new_handler p) throw();
 9     void* operator new(size_t size);
10 private:
11     static new_handler currentHandler;
12 };
13 
14 new_handler Foo::currentHandler = 0;
15 
16 void* Foo::operator new(size_t size)
17 {
18     throw bad_alloc();
19 }
20 
21 new_handler Foo::set_new_handler(new_handler p) throw()
22 {
23     //new_handler oldHandler = currentHandler;
24     //currentHandler = p;
25     std::set_new_handler(p);
26     return p;
27     //return oldHandler;
28 }
29 
30 void outOfMem()
31 {
32     cout << "out of memory" << endl;
33 }
34 
35 int main()
36 {
37     set_new_handler(outOfMem);
38     cout << "Attempting to allocate 1 GB...";
39     char* p = new char [1024*1024*1024*1024*1024];
40     cout << "Ok\n";
41     delete[] p;
42     cin.get();
43     return 0;
44 }