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## Function template operator<<

boost::xpressive::operator<< — insertion operator for sending sub-matches to ostreams

## Synopsis

    template<typename BidiIter, typename Char, typename Traits>
      std::basic_ostream< Char, Traits > &
      operator<<(std::basic_ostream< Char, Traits > & sout,
                 sub_match< BidiIter > const & sub);

## Description

Parameters:

`sout` | output stream.
`sub` | sub_match object to be written to the stream.

Returns: | sout << sub.str()

| Copyright © 2003, 2004 Eric Niebler