This book has been published in 1993 and iostreams has changed a lot since then so this book is a bit outdated. Things that were not there in 1993 include:
Surprisingly even with all these changes, most of the code in the book would still compile today. This is one sign that C++ designers took a great care to not break existing code unless absolutely necessary. The book is divided into different chapters. Materials that have still value today are:
There are easier ways to implement regular expressions with the boost library. The value that I see in the third point is that I have always kept my own operators << and >> very simple and I have found this part of the book was eye opening to what was possible to do with these functions.
The chapter that I have found to have failed the test of time is the last and very lengthy chapter that presents close to 50 small test programs so you could test that your iostream implementation was compliant with the latest C++ draft specifications for iostreams. At the publishing time, it was perhaps needed as C++ implementations were trying to catch up with a moving standard but today, iostreams specifications have been stable for many years. I think that it is safe to take for granted that your iostreams behavior is compliant with the standard or it should be a total shame for the library developer if it is not the case.
To conclude, since the book is still accurate on most points, it can still be handy as a reference if it is hanging around. However, at the same time, since iostreams have changed in subtle ways since the publishing date, I would recommend looking for a more recent book for a new purchase. I have not read it but 'Standard C++ IOStreams and Locales' might be a better choice.
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