Question

I have this code,

int main() {     std::string st;     std::stringstream ss;     ss<<'hej hej med dig'<<std::endl;      std::getline(ss,st,' ');     std::cout <<'ss.rdbuf()->str() : ' << ss.rdbuf()->str();     std::cout <<'ss.rdbuf() : ' << ss.rdbuf();     return 0; } 

Giving me this output

ss.rdbuf()->str() : hej hej med dig

ss.rdbuf() : hej med dig

But why is that? Is that because of ostreams definition of operator<str() gives me different output. In my eyes the output should be the same even if I have used getline.

Answer 1

ss.rdbuf()->str(); 

Returns copy of all buffer content.

What doing std::cout << ss.rdbuf();?

See description for

basic_ostream<charT,traits>& operator<<(basic_streambuf<charT,traits>* sb); 

It read character by character from buffer and write them to ostream, until eof/fail on writing/exception occurs.

You already have read one word from buff. Now it read rest part.