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Re: operator new returns nonzero


On Sat, Sep 7, 2013 at 2:27 PM, Marc Glisse <marc.glisse@inria.fr> wrote:
> On Sat, 7 Sep 2013, Mike Stump wrote:
>
>> On Sep 7, 2013, at 3:33 AM, Marc Glisse <marc.glisse@inria.fr> wrote:
>>>
>>> this patch teaches the compiler that operator new, when it can throw,
>>> isn't allowed to return a null pointer.
>>
>>
>> You sure:
>>
>> @item -fcheck-new
>> @opindex fcheck-new
>> Check that the pointer returned by @code{operator new} is non-null
>> before attempting to modify the storage allocated.  This check is
>> normally unnecessary because the C++ standard specifies that
>> @code{operator new} only returns @code{0} if it is declared
>> @samp{throw()}, in which case the compiler always checks the
>> return value even without this option.  In all other cases, when
>> @code{operator new} has a non-empty exception specification, memory
>> exhaustion is signalled by throwing @code{std::bad_alloc}.  See also
>> @samp{new (nothrow)}.
>>
>> ?
>
>
> Thanks, I didn't know that option. But it doesn't do the same.

Indeed.

-- Gaby


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