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On this website, the description of the iostringstream::write function says that:
In case of error, the badbit flag is set
What could those errors be?
The obvious error when writing to a stringstream would be if the underlying stringbuffer failed to allocate memory to hold the data being written. Also note, however, that the link you’ve given is to
ostream::write, which could fail for other reasons (e.g., writing to a pipe that’s been closed or a file on a disk that’s full and/or the write would exceed what the user’s allowed).Aside #1: there’s no such thing as an
iostringstream— there’sistringstreamandostringstream. The one that combines both is juststringstream.Aside #2: cplusplus.com isn’t particularly highly respected. Some other sites (e.g., cppreference.com) seem to be more dependable/accurate, at least as a general rule (though I feel obliged to point out that I don’t use any of the above much myself, so my comments on them aren’t anywhere close to the last word).