expected behaviour of << operator

[Carlo Capelli]

Hi all.

Some time ago, upgrading MSVC, i had to debug a little problem, rising from
the change of behaviour of the following code:

#include <fstream>
void main()
{
std::ofstream("dummy") << "hello" << std::endl;
}

Using MSVC6, this resulted in a file dummy containing 'hello', after the
upgrade to VisualStudio2005 the file contains the numeric
address (like a fprintf(dummy, "%p", "hello\n"), or std::ofstream("dummy")
<< (void*)"hello").

Also gc (i don't know the version) that at the time come with Dev-C++ agreed
with the former outcome.

In my POV, this was a bug of the new compiler/enviroment (i.e. some change
of scope resolution ot include...), so I queried over MS listserv,
obtaining a querelle (of rather technical level) among (i presume) the
compiler' implementors. The outcome was that the compiler should reject the
code as invalid.

What do you think about?

Bye Carlo