# Boost C++ Libraries

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This is the documentation for a snapshot of the develop branch, built from commit e028efd1e7.

### boost/vmd/tuple/to_array.hpp


//  (C) Copyright Edward Diener 2015
//  Use, modification and distribution are subject to the Boost Software License,
//  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at

#if !defined(BOOST_VMD_TUPLE_TO_ARRAY_HPP)
#define BOOST_VMD_TUPLE_TO_ARRAY_HPP

#include <boost/vmd/detail/setup.hpp>

#include <boost/preprocessor/control/iif.hpp>
#include <boost/preprocessor/tuple/to_array.hpp>
#include <boost/vmd/identity.hpp>
#include <boost/vmd/is_empty.hpp>

/*

The succeeding comments in this file are in doxygen format.

*/

/** \file
*/

/** \def BOOST_VMD_TUPLE_TO_ARRAY(tuple)

\brief converts a tuple to an array.

tuple = tuple to be converted.

If the tuple is an empty tuple it is converted to an array with 0 elements.
Otherwise the tuple is converted to an array with the same number of elements as the tuple.
*/

#define BOOST_VMD_TUPLE_TO_ARRAY(tuple) \
BOOST_VMD_IDENTITY_RESULT \
( \
BOOST_PP_IIF \
( \
BOOST_VMD_IS_EMPTY(tuple), \
BOOST_VMD_IDENTITY((0,())), \
BOOST_PP_TUPLE_TO_ARRAY \
) \
(tuple) \
) \
/**/