Best way to empty stringstream?

Question

One of the possibilities is:

somestringstream.str("");

But is it most optimal? Is there any way to preserve stringstream internal buffer, so that following operator<<() calls would not require to reserve memory again?

Answer 1

I've always done:

s.clear();//clear any bits set
s.str(std::string());

@litb gets into more detail about how to seekp to the start of the stream combined with std::ends you can keep your allocated size.