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GNU gcc 4.3 partially supports the upcoming c++0x standard: among the implemented features the rvalue reference. By means of the rvalue reference it should be possible to move a non-copyable object or return it from a function.
Are std::streams already movable by means of rvalue reference or does the current library implementation lack something?
In the current g++ svn, rvalue reference support has not yet been added to streams. I suspect adding it will not be too difficult and as ever with open source software, patches are, I’m sure, welcome!