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// (C) Copyright Edward Diener 2011-2015
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt).
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#if !defined(BOOST_VMD_IS_EMPTY_ARRAY_HPP)
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#define BOOST_VMD_IS_EMPTY_ARRAY_HPP
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#include <boost/vmd/detail/setup.hpp>
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#if BOOST_PP_VARIADICS
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#include <boost/preprocessor/control/iif.hpp>
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#include <boost/vmd/is_array.hpp>
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#include <boost/vmd/identity.hpp>
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#include <boost/vmd/detail/is_empty_array.hpp>
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/*
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The succeeding comments in this file are in doxygen format.
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*/
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/** \file
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*/
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/** \def BOOST_VMD_IS_EMPTY_ARRAY(sequence)
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\brief Tests whether a sequence is an empty Boost PP array.
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An empty Boost PP array is a two element tuple where the first
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size element is 0 and the second element is a tuple with a single
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empty element, ie. '(0,())'.
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sequence = a possible empty array
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returns = 1 if the sequence is an empty Boost PP array,
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0 if it is not.
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The macro will generate a preprocessing error if the sequence
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is in the form of an array but its first tuple element, instead
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of being a number, is a preprocessor token which VMD cannot parse,
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as in the example '(&0,())' which is a valid tuple but an invalid
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array.
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*/
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#define BOOST_VMD_IS_EMPTY_ARRAY(sequence) \
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BOOST_VMD_IDENTITY_RESULT \
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( \
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BOOST_PP_IIF \
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( \
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BOOST_VMD_IS_ARRAY(sequence), \
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BOOST_VMD_DETAIL_IS_EMPTY_ARRAY_SIZE, \
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BOOST_VMD_IDENTITY(0) \
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) \
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(sequence) \
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) \
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/**/
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/** \def BOOST_VMD_IS_EMPTY_ARRAY_D(d,sequence)
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\brief Tests whether a sequence is an empty Boost PP array. Re-entrant version.
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An empty Boost PP array is a two element tuple where the first
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size element is 0 and the second element is a tuple with a single
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empty element, ie. '(0,())'.
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d = The next available BOOST_PP_WHILE iteration. <br/>
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sequence = a possible empty array
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returns = 1 if the sequence is an empty Boost PP array,
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0 if it is not.
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The macro will generate a preprocessing error if the sequence
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is in the form of an array but its first tuple element, instead
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of being a number, is a preprocessor token which VMD cannot parse,
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as in the example '(&0,())' which is a valid tuple but an invalid
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array.
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*/
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#define BOOST_VMD_IS_EMPTY_ARRAY_D(d,sequence) \
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BOOST_VMD_IDENTITY_RESULT \
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( \
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BOOST_PP_IIF \
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( \
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BOOST_VMD_IS_ARRAY_D(d,sequence), \
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BOOST_VMD_DETAIL_IS_EMPTY_ARRAY_SIZE, \
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BOOST_VMD_IDENTITY(0) \
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) \
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(sequence) \
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) \
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/**/
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#endif /* BOOST_PP_VARIADICS */
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#endif /* BOOST_VMD_IS_EMPTY_ARRAY_HPP */
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