Streaming into `char` array with `ostream` - how to get characters written count?

Question

This answer shows how to write to an array with stringstream, but can we obtain the total number of characters written? Surely the stringstream has some information to know where to put the next character, but I don't know how to access it.

The OP of the linked question even asks this in a comment but I wanted a separate question to be sure.

I know ostrstream has a pcount method, unfortunately, it is deprecated.

“unfortunately, it is deprecated” — deprecated doesn’t mean it doesn’t work. It means only that it might be removed from the standard in the future. If it gets removed, sane implementations will continue to provide it. — Pete Becker
– Pete Becker, Commented Aug 29, 2022 at 22:00

Remy Lebeau · Accepted Answer · 2022-08-29 22:39:38Z

The std::ostrstream class itself is deprecated.

Use std::ostringstream instead, which has a tellp() method.

#include <sstream> int main() { char buf[1024]; std::ostringstream stream; stream.rdbuf()->pubsetbuf(buf, sizeof(buf)); auto start = stream.tellp(); stream << "Hello " << "World " << std::endl; auto written = stream.tellp() - start; //... }

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