Should basic_*stream::is_open() be const?

[Paolo Carlini]

Andreas Kohn wrote:

>So, if I read this correctly, "Note that implementers can make this
>change in a binary compatible way by providing both overloads; this
>would be a conforming extension." overloads could be added to libstdc++
>without violating the standard?
>
>Is anything like that planned?
>  
>
Ok, I'm going to apply the below to mainline (would be 3.5.0 or 4.0), not to
the release branch, however, since we want complete backward and forward
compatibility.

Tested x86-linux.

Paolo.

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