Re: Invalid cast

[Alf P. Steinbach]

* Frederic Mayot:
> Hi,
> Can someone give me an explanation why the following code produces a
> bug. I think it's related to the compiler and that the first line is
> not OK. I have no pb with gcc 3.4 but the bug appeared with gcc 4.1.1
> A* p = ...;
> int l;
> (char*&)p += l;
> The right way is
> p = reinterpret_cast<A*>(reinterpret_cast<char*>(p) + l);

reinterpret_cast, or a C-style cast that resolves to reinterpret_cast, 
is a sure way to introduce a bug.

Remove the casts (you'll probably have to fix other code) and chances 
are you're removing the bug too.

Hope this helps.

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