c++ - How can I copy value from ostringstream to string? -

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i tried :

ostringstream oss; read string file , put oss; string str; str << oss.str();// error here "error: no match ‘operator>>’ in 'oss >> str' "

if use str = oss.str(); instead of printing value of string, prints out "....0xbfad75c40xbfad75c40xbf...." likes memory address.
can tell me why? thank you.

string str = oss.str(); // should trick

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