56 lines
2.1 KiB
C++
56 lines
2.1 KiB
C++
# /* Copyright (C) 2001
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# * Housemarque Oy
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# * http://www.housemarque.com
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# *
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# * Distributed under the Boost Software License, Version 1.0. (See
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# * 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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# */
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#
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# /* Revised by Paul Mensonides (2002-2011) */
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# /* Revised by Edward Diener (2011,2014,2020) */
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#
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# /* See http://www.boost.org for most recent version. */
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#
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# ifndef BOOST_PREPROCESSOR_TUPLE_ELEM_HPP
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# define BOOST_PREPROCESSOR_TUPLE_ELEM_HPP
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#
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# include <boost/preprocessor/cat.hpp>
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# include <boost/preprocessor/config/config.hpp>
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# include <boost/preprocessor/facilities/expand.hpp>
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# include <boost/preprocessor/facilities/overload.hpp>
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# include <boost/preprocessor/tuple/rem.hpp>
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# include <boost/preprocessor/variadic/elem.hpp>
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# include <boost/preprocessor/tuple/detail/is_single_return.hpp>
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#
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# if BOOST_PP_VARIADICS_MSVC
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# define BOOST_PP_TUPLE_ELEM(...) BOOST_PP_TUPLE_ELEM_I(BOOST_PP_OVERLOAD(BOOST_PP_TUPLE_ELEM_O_, __VA_ARGS__), (__VA_ARGS__))
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# define BOOST_PP_TUPLE_ELEM_I(m, args) BOOST_PP_TUPLE_ELEM_II(m, args)
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# define BOOST_PP_TUPLE_ELEM_II(m, args) BOOST_PP_CAT(m ## args,)
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/*
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Use BOOST_PP_REM_CAT if it is a single element tuple ( which might be empty )
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else use BOOST_PP_REM. This fixes a VC++ problem with an empty tuple and BOOST_PP_TUPLE_ELEM
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functionality. See tuple_elem_bug_test.cxx.
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*/
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# define BOOST_PP_TUPLE_ELEM_O_2(n, tuple) \
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BOOST_PP_VARIADIC_ELEM(n, BOOST_PP_EXPAND(BOOST_PP_TUPLE_IS_SINGLE_RETURN(BOOST_PP_REM_CAT,BOOST_PP_REM,tuple) tuple)) \
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/**/
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# else
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# define BOOST_PP_TUPLE_ELEM(...) BOOST_PP_OVERLOAD(BOOST_PP_TUPLE_ELEM_O_, __VA_ARGS__)(__VA_ARGS__)
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# define BOOST_PP_TUPLE_ELEM_O_2(n, tuple) BOOST_PP_VARIADIC_ELEM(n, BOOST_PP_REM tuple)
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# endif
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# define BOOST_PP_TUPLE_ELEM_O_3(size, n, tuple) BOOST_PP_TUPLE_ELEM_O_2(n, tuple)
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#
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# /* directly used elsewhere in Boost... */
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#
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# define BOOST_PP_TUPLE_ELEM_1_0(a) a
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#
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# define BOOST_PP_TUPLE_ELEM_2_0(a, b) a
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# define BOOST_PP_TUPLE_ELEM_2_1(a, b) b
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#
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# define BOOST_PP_TUPLE_ELEM_3_0(a, b, c) a
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# define BOOST_PP_TUPLE_ELEM_3_1(a, b, c) b
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# define BOOST_PP_TUPLE_ELEM_3_2(a, b, c) c
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#
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# endif
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