strstream was adopted into C++98 with conflicting implementations, so was deprecated at the outset. You are warned not to use the conflicting parts in code meant to be portable.
strstream has not been removed, yet, because spanstream is not in yet. Until that is in, there are certain things only strstream can do: specifically, attach to an existing buffer you need to parse things out of, or to format things into.
strstream has not been removed, yet, because spanstream is not in yet. Until that is in, there are certain things only strstream can do: specifically, attach to an existing buffer you need to parse things out of, or to format things into.