2 // (C) Copyright Edward Diener 2015
3 // Use, modification and distribution are subject to the Boost Software License,
4 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
5 // http://www.boost.org/LICENSE_1_0.txt).
7 #if !defined(BOOST_VMD_TUPLE_POP_BACK_HPP)
8 #define BOOST_VMD_TUPLE_POP_BACK_HPP
10 #include <boost/vmd/detail/setup.hpp>
12 #if BOOST_PP_VARIADICS
14 #include <boost/preprocessor/comparison/equal.hpp>
15 #include <boost/preprocessor/control/iif.hpp>
16 #include <boost/preprocessor/tuple/pop_back.hpp>
17 #include <boost/preprocessor/tuple/size.hpp>
18 #include <boost/vmd/empty.hpp>
22 The succeeding comments in this file are in doxygen format.
29 /** \def BOOST_VMD_TUPLE_POP_BACK(tuple)
31 \brief pops an element from the end of a tuple.
33 tuple = tuple to pop an element from.
35 If the tuple is an empty tuple the result is undefined.
36 If the tuple is a single element the result is an empty tuple.
37 Otherwise the result is a tuple after removing the last element.
40 #define BOOST_VMD_TUPLE_POP_BACK(tuple) \
43 BOOST_PP_EQUAL(BOOST_PP_TUPLE_SIZE(tuple),1), \
45 BOOST_PP_TUPLE_POP_BACK \
50 /** \def BOOST_VMD_TUPLE_POP_BACK_Z(z,tuple)
52 \brief pops an element from the end of a tuple. It reenters BOOST_PP_REPEAT with maximum efficiency.
54 z = the next available BOOST_PP_REPEAT dimension. <br/>
55 tuple = tuple to pop an element from.
57 If the tuple is an empty tuple the result is undefined.
58 If the tuple is a single element the result is an empty tuple.
59 Otherwise the result is a tuple after removing the last element.
62 #define BOOST_VMD_TUPLE_POP_BACK_Z(z,tuple) \
65 BOOST_PP_EQUAL(BOOST_PP_TUPLE_SIZE(tuple),1), \
67 BOOST_PP_TUPLE_POP_BACK_Z \
72 #endif /* BOOST_PP_VARIADICS */
73 #endif /* BOOST_VMD_TUPLE_POP_BACK_HPP */