Boost C++ Libraries of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for an old version of Boost. Click here to view this page for the latest version.


Get the last error associated with the stream.

const boost::system::error_code & error() const;
Return Value

An error_code corresponding to the last error from the stream.


To print the error associated with a failure to establish a connection:

tcp::iostream s("", "http");
if (!s)
  std::cout << "Error: " << s.error().message() << std::endl;