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I like to use std::ostrstream to format text but not print it to stdout but instead write it into an std::string (by accessing the std::ostrstream::str() member). Apparently this is deprecated now. So, how am I supposed to write formatted objects to a string, with the same convenience as when writing to a stream?
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std::ostringstreamOutput stream class to operate on strings. Objects of this class use a string buffer that contains a sequence of characters. This sequence of characters can be accessed directly as a string object, using member str .
A stringstream is an iostream object that uses a std::string as a backing store. An ostringstream writes to a std::string . An istringstream reads from a std::string . You read & write from & to an istringstream or ostringstream using << and >> , just like any other iostream object.
You could use std::ostringstream. Similarly, instead of std::istrstream you should use std::istringstream. You need to include the <sstream> header for these classes.
You could also see this question which explains why strstream was deprecated.
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As others have already said, std::ostringstream is the replacement.
It's more convenient (and safer) than std::ostrstream because it manages all memory automatically so you don't need to call freeze(false) to ensure the memory gets freed when you're finished with it.
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