c++ - Why was std::strstream deprecated?

Question

I recently discovered that std::strstream has been deprecated in favor of std::stringstream. It's been a while since I've used it, but it did what I needed to do at the time, so was surprised to hear of its deprecation.

My question is why was this decision made, and what benefits does std::stringstream provide that are absent from std::strstream?

Answer 1

The strstream returned a char * that was very difficult to manage, as nowhere was it stated how it had been allocated. It was thus impossible to know if you should delete it or call free() on it or do something else entirely. About the only really satisfactory way to deallocate it was to hand it back to the strstream via the freeze() function. This was sufficiently non-obvious, that lots of people got it wrong. The stringstream returns a string object which manages itself, which is far less error prone.

There was also the issue of having to use ends to terminate the string, but I believe the deallocation problem was the main reason for deprecation.