Re: new returning 0
On May 30, 11:51 pm, Noah Roberts <u...@example.net> wrote:
Noah Roberts wrote:
Lionel B wrote:
A minimal example demonstrating the problem might be useful - perhaps
someone with the same compiler might be able to cast some light (and
of course creating minimal examples frequently throws up the answer).
Such a sample cannot be created. Not without knowing how to do so; of
course, I've only spent 4 hours trying. All versions, even those with
exceptions turned off, throw a bad_alloc.
Once I know how to create the problem I can solve it by reversing that
creation in the problem program.
More on my attempt to solve the problem or even recreate it:
The program that is doing this uses a DLL that is allocating the memory.
I don't know if being a DLL has anything to do with it or not because
I've tried going down that road as well. One thing for certain, the
problem program is calling a non-standard operator new (size_t, int,
char const*, int) inside of dbgnew.cpp.
In sum, a user defined overload of operator new. According to
the standard, unless the user defined overload has an empty
exception specification, it isn't allowed to return a null
pointer. This may be a case where the user defined overload was
written before the standard, and needs to be corrected.
I can't get my small version to
call this function.
Not even if you do ``new ( 0, "", 0 ) Toto'', and link
statically with the operator? (I'm not sure how VC++ handles
operator new() when linking dynamically.)
I think I'm treading too far into implementation specific behavior to
get much help here (especially with the police population) but maybe
someone has seen this, maybe not.
Well, the new you describe isn't standard, and is certainly not
present in most cases. But the general behavior of new is.
And I think you owe Victor an apology. He can hardly be blamed
for not guessing that you had a user defined overload somewhere,
especially when you said you didn't.
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James Kanze (GABI Software) email:james.kanze@gmail.com
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