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In C++20 variadic data can be empty. This means that BOOST_PP_VARIADIC_SIZE now returns 0 for empty data instead of 1, and that conversions to and from empty variadic data and lists or arrays, which can be empty, work properly.

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Edward Diener
2020-06-29 21:57:23 -04:00
parent ffb26db146
commit 3ac4c915a3
14 changed files with 173 additions and 16 deletions
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18
include/boost/preprocessor/array/enum.hpp
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@ -15,11 +15,27 @@
#
# include <boost/preprocessor/cat.hpp>
# include <boost/preprocessor/config/config.hpp>
# include <boost/preprocessor/control/if.hpp>
# include <boost/preprocessor/array/size.hpp>
# include <boost/preprocessor/tuple/rem.hpp>
# include <boost/preprocessor/variadic/has_opt.hpp>
#
# /* BOOST_PP_ARRAY_ENUM */
#
# if BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC()
# if BOOST_PP_VARIADIC_HAS_OPT()
# if BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC()
# define BOOST_PP_ARRAY_ENUM_NOT_EMPTY(array) BOOST_PP_ARRAY_ENUM_I(BOOST_PP_TUPLE_REM_CTOR, array)
# define BOOST_PP_ARRAY_ENUM_I(m, args) BOOST_PP_ARRAY_ENUM_II(m, args)
# define BOOST_PP_ARRAY_ENUM_II(m, args) BOOST_PP_CAT(m ## args,)
# elif BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC()
# define BOOST_PP_ARRAY_ENUM_NOT_EMPTY(array) BOOST_PP_ARRAY_ENUM_I(array)
# define BOOST_PP_ARRAY_ENUM_I(array) BOOST_PP_TUPLE_REM_CTOR ## array
# else
# define BOOST_PP_ARRAY_ENUM_NOT_EMPTY(array) BOOST_PP_TUPLE_REM_CTOR array
# endif
# define BOOST_PP_ARRAY_ENUM_EMPTY(array)
# define BOOST_PP_ARRAY_ENUM(array) BOOST_PP_IF(BOOST_PP_ARRAY_SIZE(array),BOOST_PP_ARRAY_ENUM_NOT_EMPTY,BOOST_PP_ARRAY_ENUM_EMPTY)(array)
# elif BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC()
# define BOOST_PP_ARRAY_ENUM(array) BOOST_PP_ARRAY_ENUM_I(BOOST_PP_TUPLE_REM_CTOR, array)
# define BOOST_PP_ARRAY_ENUM_I(m, args) BOOST_PP_ARRAY_ENUM_II(m, args)
# define BOOST_PP_ARRAY_ENUM_II(m, args) BOOST_PP_CAT(m ## args,)