The difference between Sstream and Strstream in C + + standard library detailed analysis _c language

There are two types of string flows in C + +, one defined in Sstream and the other defined in Strstream. What they achieve is basically the same thing.

Strstream contains
Class Strstreambuf;
Class Istrstream;
Class Ostrstream;
Class Strstream;
They are written based on the C type string char*

Included in the Sstream
Class Istringstream;
Class Ostringstream;
Class Stringbuf;
Class StringStream;
Class .....
They're written based on std::string.

So Ostrstream::str () returns a string of char* types
and Ostringstream::str () returns a string of std::string types

Note the difference between the two when you use it, and generally recommend using the std::string type of string
Of course, if you want to maintain compatibility with C, it's also a good choice to use Strstream.