# Boost C++ Libraries

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This is the documentation for a snapshot of the develop branch, built from commit d4128b739e.

### boost/vmd/to_seq.hpp


//  (C) Copyright Edward Diener 2011-2015
//  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_TO_SEQ_HPP)
#define BOOST_VMD_TO_SEQ_HPP

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

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

/*

The succeeding comments in this file are in doxygen format.

*/

/** \file
*/

/** \def BOOST_VMD_TO_SEQ(...)

\brief Converts a sequence to a Boost PP seq whose elements are the elements of the sequence.

The first variadic parameter is required and is the sequence to convert.

Further optional variadic parameters can be return type parameters. Return type
parameters allow each element in the sequence to be converted to a two-element
tuple where the first tuple element is the type and the second tuple element
is the element data.

The BOOST_VMD_RETURN_NO_TYPE, the default, does not return the type as part of each
converted element but just the data. All of the rest return the type and data as the
two-element tuple. If BOOST_VMD_RETURN_TYPE is specified the specific type of the element
is returned in the tuple. If BOOST_VMD_RETURN_TYPE_ARRAY is specified an array type is
returned if the element is an array, else a tuple type is returned if the element is a tuple,
else the actual type is returned for non-tuple data. If BOOST_VMD_RETURN_TYPE_LIST is specified
a list type is returned if the element is a list, else a tuple type is returned if the element
is a tuple, else the actual type is returned for non-tuple data. If BOOST_VMD_RETURN_TYPE_TUPLE
is specified a tuple type is returned for all tuple-like data, else the actual type is returned
for non-tuple data. If more than one return type optional parameter is specified the last one
specified determines the return type.

returns   = A Boost PP seq. If the sequence is empty the return is emptiness
since an empty seq does not exist. If an optional return type other
than BOOST_VMD_RETURN_NO_TYPE is specified the type and the data of
each element is returned as the seq element. Otherwise just the data
is returned as the seq element, which is the default.

*/

#define BOOST_VMD_TO_SEQ(...) \
BOOST_VMD_DETAIL_SEQUENCE_TO_SEQ(__VA_ARGS__) \
/**/

/** \def BOOST_VMD_TO_SEQ_D(d,...)

\brief Converts a sequence to a Boost PP seq whose elements are the elements of the sequence. Re-entrant version.

d         = The next available BOOST_PP_WHILE iteration. <br/>

The first variadic parameter is required and is the sequence to convert.

Further optional variadic parameters can be return type parameters. Return type
parameters allow each element in the sequence to be converted to a two-element
tuple where the first tuple element is the type and the second tuple element
is the element data.

The BOOST_VMD_RETURN_NO_TYPE, the default, does not return the type as part of each
converted element but just the data. All of the rest return the type and data as the
two-element tuple. If BOOST_VMD_RETURN_TYPE is specified the specific type of the element
is returned in the tuple. If BOOST_VMD_RETURN_TYPE_ARRAY is specified an array type is
returned if the element is an array, else a tuple type is returned if the element is a tuple,
else the actual type is returned for non-tuple data. If BOOST_VMD_RETURN_TYPE_LIST is specified
a list type is returned if the element is a list, else a tuple type is returned if the element
is a tuple, else the actual type is returned for non-tuple data. If BOOST_VMD_RETURN_TYPE_TUPLE
is specified a tuple type is returned for all tuple-like data, else the actual type is returned
for non-tuple data. If more than one return type optional parameter is specified the last one
specified determines the return type.

returns   = A Boost PP seq. If the sequence is empty the return is emptiness
since an empty seq does not exist. If an optional return type other
than BOOST_VMD_RETURN_NO_TYPE is specified the type and the data of
each element is    returned as the seq element. Otherwise just the data
is returned as the seq element, which is the default.

*/

#define BOOST_VMD_TO_SEQ_D(d,...) \
BOOST_VMD_DETAIL_SEQUENCE_TO_SEQ_D(d,__VA_ARGS__) \
/**/