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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_TUPLE_POP_BACK_HPP)
+#define BOOST_VMD_TUPLE_POP_BACK_HPP
+
+#include <boost/vmd/detail/setup.hpp>
+
+#if BOOST_PP_VARIADICS
+
+#include <boost/preprocessor/comparison/equal.hpp>
+#include <boost/preprocessor/control/iif.hpp>
+#include <boost/preprocessor/tuple/pop_back.hpp>
+#include <boost/preprocessor/tuple/size.hpp>
+#include <boost/vmd/empty.hpp>
+
+/*
+
+ The succeeding comments in this file are in doxygen format.
+
+*/
+
+/** \file
+*/
+
+/** \def BOOST_VMD_TUPLE_POP_BACK(tuple)
+
+ \brief pops an element from the end of a tuple.
+
+ tuple = tuple to pop an element from.
+
+ If the tuple is an empty tuple the result is undefined.
+ If the tuple is a single element the result is an empty tuple.
+ Otherwise the result is a tuple after removing the last element.
+*/
+
+#define BOOST_VMD_TUPLE_POP_BACK(tuple) \
+ BOOST_PP_IIF \
+ ( \
+ BOOST_PP_EQUAL(BOOST_PP_TUPLE_SIZE(tuple),1), \
+ BOOST_VMD_EMPTY, \
+ BOOST_PP_TUPLE_POP_BACK \
+ ) \
+ (tuple) \
+/**/
+
+/** \def BOOST_VMD_TUPLE_POP_BACK_Z(z,tuple)
+
+ \brief pops an element from the end of a tuple. It reenters BOOST_PP_REPEAT with maximum efficiency.
+
+ z = the next available BOOST_PP_REPEAT dimension.
+ tuple = tuple to pop an element from.
+
+ If the tuple is an empty tuple the result is undefined.
+ If the tuple is a single element the result is an empty tuple.
+ Otherwise the result is a tuple after removing the last element.
+*/
+
+#define BOOST_VMD_TUPLE_POP_BACK_Z(z,tuple) \
+ BOOST_PP_IIF \
+ ( \
+ BOOST_PP_EQUAL(BOOST_PP_TUPLE_SIZE(tuple),1), \
+ BOOST_VMD_EMPTY, \
+ BOOST_PP_TUPLE_POP_BACK_Z \
+ ) \
+ (z,tuple) \
+/**/
+
+#endif /* BOOST_PP_VARIADICS */
+#endif /* BOOST_VMD_TUPLE_POP_BACK_HPP */