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Aardvajk

Trivial std::istream question

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Sorry to bother you all with such a trivial question, but I've been trawling the net and can't seem to find an answer. If I do, say:
void f(std::istream &is)
{
    int i=10;

    is >> i;
}
If the >> operation fails for whatever reason (i.e. not a valid integer in the stream for example), does the C++ standard guarantee that the original value of i will not be changed, or is it better to save the value and reassign it if the >> operation fails? Ta. Paul

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