85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
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// (C) Copyright Edward Diener 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_TUPLE_REMOVE_HPP)
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#define BOOST_VMD_TUPLE_REMOVE_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/comparison/equal.hpp>
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#include <boost/preprocessor/control/iif.hpp>
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#include <boost/preprocessor/logical/bitand.hpp>
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#include <boost/preprocessor/tuple/remove.hpp>
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#include <boost/preprocessor/tuple/size.hpp>
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#include <boost/vmd/empty.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_TUPLE_REMOVE(tuple,index)
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\brief removes an element from a tuple.
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tuple = tuple from which an element is to be removed.
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index = The zero-based position in tuple of the element to be removed.
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If index is greater or equal to the tuple size the result is undefined.
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If the tuple is a single element and the index is 0 the result is an empty tuple.
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Otherwise the result is a tuple after removing the index element.
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*/
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#define BOOST_VMD_TUPLE_REMOVE(tuple,index) \
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BOOST_PP_IIF \
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( \
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BOOST_PP_BITAND \
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( \
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BOOST_PP_EQUAL(index,0), \
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BOOST_PP_EQUAL(BOOST_PP_TUPLE_SIZE(tuple),1) \
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), \
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BOOST_VMD_EMPTY, \
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BOOST_PP_TUPLE_REMOVE \
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) \
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(tuple,index) \
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/**/
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/** \def BOOST_VMD_TUPLE_REMOVE_D(d,tuple,index)
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\brief removes an element from a tuple. It reenters BOOST_PP_WHILE with maximum efficiency.
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d = The next available BOOST_PP_WHILE iteration.
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tuple = tuple from which an element is to be removed.
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index = The zero-based position in tuple of the element to be removed.
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If index is greater or equal to the tuple size the result is undefined.
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If the tuple is a single element and the index is 0 the result is an empty tuple.
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Otherwise the result is a tuple after removing the index element.
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*/
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#define BOOST_VMD_TUPLE_REMOVE_D(d,tuple,index) \
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BOOST_PP_IIF \
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( \
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BOOST_PP_BITAND \
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( \
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BOOST_PP_EQUAL_D(d,index,0), \
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BOOST_PP_EQUAL_D(d,BOOST_PP_TUPLE_SIZE(tuple),1) \
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), \
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BOOST_VMD_EMPTY, \
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BOOST_PP_TUPLE_REMOVE_D \
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) \
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(d,tuple,index) \
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/**/
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#endif /* BOOST_PP_VARIADICS */
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#endif /* BOOST_VMD_TUPLE_REMOVE_HPP */
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