new Throwing bad_alloc on Failure

Figure 17.5 demonstrates new implicitly throwing bad_alloc on failure to allocate the requested memory. The for statement (lines 16–20) inside the try block should loop 50 times and, on each pass, allocate an array of 50,000,000 double values. If new fails and throws a bad_alloc exception, the loop terminates, and the program continues in line 22, where the catch handler catches and processes the exception. Lines 24–25 print the message "Exception occurred:" followed by the message returned from the base-class-exception version of function what (i.e., an implementation-defined exception-specific message, such as "bad allocation" in Microsoft Visual C++). The output shows that the program performed only four iterations of the loop before new failed and threw the bad_alloc exception. Your output might differ based on the physical memory, disk space available for virtual memory on your system and the compiler you’re using.