# Boost Exception

### operator<</tuple

#include <boost/exception/info_tuple.hpp>

    namespace
    boost
        {
        template <class E, class Tag1, class T1, ..., class TagN, class TN>
        E const & operator<<( E const & x,
            tuple<
                error_info<Tag1,T1>,
                ...,
                error_info<TagN,TN> > const & v );
        }

#### Requirements:

E must be boost::exception, or a type that derives (indirectly) from boost::exception.

#### Effects:

Equivalent to x << v.get<0>() << ... << v.get<N>().

#### Returns:

x.

#### Throws:

std::bad_alloc, or any exception emitted by T1..TN copy constructor.

### See Also:

Boost Exception
boost/exception/info_tuple.hpp