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vmd
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pop_back.hpp
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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. <br/> 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 */