On Tue, May 6, 2008 at 11:12 PM, Xavier Delacour
<[EMAIL PROTECTED]> wrote:
> > Indeed, I get a segfault at this point. When debugging, I see that
> > vector<T>::operator[] is really executed with an out-of-bound index.
> > And this really dereference and invalid memory location. If you look
> > into MSVC header you find something like:
> >
> > reference operator[](size_type _Pos)
> > { // subscript mutable sequence
> > return (*(_Myfirst + _Pos));
> > }
>
> Huh. Well, I wouldn't expect this to "dereference" (_Myfirst + _Pos),
> by which I mean "read the byte from memory" any more than I would
> expect
>
> char* p = (char*) 0;
> char& r = *p;
Sorry, I was wrong in my previous analysis. In the sample code above,
I removed some parts, because I thought they were not related to the
problem. However, before the "return" statement, there is some code
that checks whether _Pos is a valid index within vector range.
This validation function produces a runtime error and makes the
program exits. So, in the end, it's not a dereferencing problem, but
a runtime error due to some bound-checking code.
Michael.
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