Does "stringstream" copy the string on which it is constructed?

Question

In a piece of code like this one

std::string s("random;string;");
std::stringstream s_stream(s);

does s_stream make a copy of s?

I mean, what would happen if, after creating s_stream, I modified s?

Answer 1

Yes. From http://en.cppreference.com/w/cpp/io/basic_stringstream/basic_stringstream

2) Uses a copy of str as initial contents of the underlying string device. The underlying basic_stringbuf object is constructed as basic_stringbuf<Char,Traits,Allocator>(str, mode).