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+
+// (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
+// http://www.boost.org/LICENSE_1_0.txt).
+
+#if !defined(BOOST_VMD_SEQ_SIZE_HPP)
+#define BOOST_VMD_SEQ_SIZE_HPP
+
+#include <boost/vmd/detail/setup.hpp>
+
+#if BOOST_PP_VARIADICS
+
+#include <boost/preprocessor/control/iif.hpp>
+#include <boost/preprocessor/seq/size.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_SEQ_SIZE(seq)
+
+ \brief expands to the size of the seq passed to it.
+
+ seq = seq whose size is to be extracted.
+
+ If the seq is an empty seq its size is 0.
+ Otherwise the result is the number of elements in the seq.
+*/
+
+#define BOOST_VMD_SEQ_SIZE(seq) \
+ BOOST_VMD_IDENTITY_RESULT \
+ ( \
+ BOOST_PP_IIF \
+ ( \
+ BOOST_VMD_IS_EMPTY(seq), \
+ BOOST_VMD_IDENTITY(0), \
+ BOOST_PP_SEQ_SIZE \
+ ) \
+ (seq) \
+ ) \
+/**/
+
+#endif /* BOOST_PP_VARIADICS */
+#endif /* BOOST_VMD_SEQ_SIZE_HPP */