Check the new operator's return value?

This is a discussion on Check the new operator's return value? within the C++ Programming forums, part of the General Programming Boards category; Hey all, Very simple question. Is it necessary to check the return value of the new operator when allocating memory, ...

  1. #1
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    Check the new operator's return value?

    Hey all,

    Very simple question. Is it necessary to check the return value of the new operator when allocating memory, to ensure that memory was allocated correctly, like in C with malloc()? I've seen some articles that seem to contradict themselves a bit, and even talk about overloading the new/delete operators to throw exceptions using std::bad_alloc(), but I just wondered if it was needed.

    Example code:

    Code:
    int *foo = new int;
    
    /* Is this check needed? */
    if (foo == NULL)
    ...
    Thanks in advance,

    --John.

  2. #2
    Open to suggestions Brighteyes's Avatar
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    /* Is this check needed? */
    It depends on how operator new is defined for your compiler. In older compilers, new returned a null pointer if it failed, just like malloc. These days new throws a bad_alloc exception if it fails and you can either set up a handler with set_new_handler, or use try..catch blocks to catch the exception. If you want to use the null pointer method, the current C++ standard lets you do it by specifying nothrow
    Code:
    int *foo = new(nothrow) int;
    p.s. What the alphabet would look like without q and r.

  3. #3
    Registered User
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    Ah thank you very much. I'll use nothrow as I've always liked the NULL pointer method.

    Thanks mate,

    --John.

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