# Boost C++ Libraries

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

### boost/vmd/is_empty_list.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_IS_EMPTY_LIST_HPP)
#define BOOST_VMD_IS_EMPTY_LIST_HPP

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

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

/*

The succeeding comments in this file are in doxygen format.

*/

/** \file
*/

/** \def BOOST_VMD_IS_EMPTY_LIST(sequence)

\brief Tests whether a sequence is an empty Boost PP list.

An empty Boost PP list consists of the single identifier 'BOOST_PP_NIL'.
This identifier also serves as a list terminator for a non-empty list.

sequence = a preprocessor parameter

returns = 1 if the sequence is an empty Boost PP list,
0 if it is not.

The macro will generate a preprocessing error if the input
as an empty list marker, instead of being an identifier, is
a preprocessor token which VMD cannot parse, as in the
example '&BOOST_PP_NIL'.

*/

#define BOOST_VMD_IS_EMPTY_LIST(sequence) \
BOOST_VMD_DETAIL_IS_LIST_IS_EMPTY_LIST_PROCESS(sequence) \
/**/

/** \def BOOST_VMD_IS_EMPTY_LIST_D(d,sequence)

\brief Tests whether a sequence is an empty Boost PP list. Re-entrant version.

An empty Boost PP list consists of the single identifier 'BOOST_PP_NIL'.
This identifier also serves as a list terminator for a non-empty list.

d        = The next available BOOST_PP_WHILE iteration <br/>
sequence = a preprocessor parameter

returns = 1 if the sequence is an empty Boost PP list,
0 if it is not.

The macro will generate a preprocessing error if the input
as an empty list marker, instead of being an identifier, is
a preprocessor token which VMD cannot parse, as in the
example '&BOOST_PP_NIL'.

*/

#define BOOST_VMD_IS_EMPTY_LIST_D(d,sequence) \
BOOST_VMD_DETAIL_IS_LIST_IS_EMPTY_LIST_PROCESS_D(d,sequence) \
/**/