vmd/seq/remove.hpp

0001
0002 //  (C) Copyright Edward Diener 2015
0003 //  Use, modification and distribution are subject to the Boost Software License,
0004 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
0005 //  http://www.boost.org/LICENSE_1_0.txt).
0006
0007 #if !defined(BOOST_VMD_SEQ_REMOVE_HPP)
0008 #define BOOST_VMD_SEQ_REMOVE_HPP
0009
0010 #include <boost/vmd/detail/setup.hpp>
0011
0012 #if BOOST_PP_VARIADICS
0013
0014 #include <boost/preprocessor/comparison/equal.hpp>
0015 #include <boost/preprocessor/control/iif.hpp>
0016 #include <boost/preprocessor/logical/bitand.hpp>
0017 #include <boost/preprocessor/seq/remove.hpp>
0018 #include <boost/preprocessor/seq/size.hpp>
0019 #include <boost/vmd/empty.hpp>
0020
0021 /*
0022
0023   The succeeding comments in this file are in doxygen format.
0024
0025 */
0026
0027 /** \file
0028 */
0029
0030 /** \def BOOST_VMD_SEQ_REMOVE(seq,index)
0031
0032     \brief removes an element from a seq.
0033
0034     seq = seq from which an element is to be removed. <br/>
0035     index = The zero-based position in seq of the element to be removed.
0036
0037     If index is greater or equal to the seq size the result is undefined.
0038     If the seq is a single element and the index is 0 the result is an empty seq.
0039     Otherwise the result is a seq after removing the index element.
0040 */
0041
0042 #define BOOST_VMD_SEQ_REMOVE(seq,index) \
0043     BOOST_PP_IIF \
0044         ( \
0045         BOOST_PP_BITAND \
0046             ( \
0047             BOOST_PP_EQUAL(index,0), \
0048             BOOST_PP_EQUAL(BOOST_PP_SEQ_SIZE(seq),1) \
0049             ), \
0050         BOOST_VMD_EMPTY, \
0051         BOOST_PP_SEQ_REMOVE \
0052         ) \
0053     (seq,index) \
0054 /**/
0055
0056 #endif /* BOOST_PP_VARIADICS */
0057 #endif /* BOOST_VMD_SEQ_REMOVE_HPP */