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Changed functionality so empty arrays/lists when converted to a seq or a tuple expand to nothing.

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This commit is contained in:
Edward Diener
2014-05-05 20:49:20 -04:00
parent 181a88db7e
commit 1f16a481c7
6 changed files with 68 additions and 21 deletions
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14
include/boost/preprocessor/list/to_array.hpp
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@ -137,6 +137,20 @@
#
# /* BOOST_PP_LIST_TO_ARRAY_D */
#
# if BOOST_PP_VARIADICS && BOOST_PP_VARIADICS_MSVC && (_MSC_VER <= 1400)
# define BOOST_PP_LIST_TO_ARRAY_D(d, list) \
BOOST_PP_IIF \
( \
BOOST_PP_LIST_IS_NIL(list), \
BOOST_PP_LIST_TO_ARRAY_D_VC8ORLESS_EMPTY, \
BOOST_PP_LIST_TO_ARRAY_D_VC8ORLESS_DO \
) \
(d, list) \
/**/
# define BOOST_PP_LIST_TO_ARRAY_D_VC8ORLESS_EMPTY(d, list) (0,())
# define BOOST_PP_LIST_TO_ARRAY_D_VC8ORLESS_DO(d, list) BOOST_PP_LIST_TO_ARRAY_I(BOOST_PP_WHILE_ ## d, list)
# else
# define BOOST_PP_LIST_TO_ARRAY_D(d, list) BOOST_PP_LIST_TO_ARRAY_I(BOOST_PP_WHILE_ ## d, list)
# endif
#
# endif /* BOOST_PREPROCESSOR_LIST_TO_ARRAY_HPP */

30
include/boost/preprocessor/list/to_tuple.hpp
View File

@ -16,22 +16,44 @@
#
# include <boost/preprocessor/config/config.hpp>
# include <boost/preprocessor/list/enum.hpp>
# include <boost/preprocessor/control/iif.hpp>
# include <boost/preprocessor/facilities/empty.hpp>
#
# /* BOOST_PP_LIST_TO_TUPLE */
#
# define BOOST_PP_LIST_TO_TUPLE(list) \
BOOST_PP_IIF \
( \
BOOST_PP_LIST_IS_NIL(list), \
BOOST_PP_EMPTY, \
BOOST_PP_LIST_TO_TUPLE_DO \
) \
(list) \
/**/
#
# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
# define BOOST_PP_LIST_TO_TUPLE(list) (BOOST_PP_LIST_ENUM(list))
# define BOOST_PP_LIST_TO_TUPLE_DO(list) (BOOST_PP_LIST_ENUM(list))
# else
# define BOOST_PP_LIST_TO_TUPLE(list) BOOST_PP_LIST_TO_TUPLE_I(list)
# define BOOST_PP_LIST_TO_TUPLE_DO(list) BOOST_PP_LIST_TO_TUPLE_I(list)
# define BOOST_PP_LIST_TO_TUPLE_I(list) (BOOST_PP_LIST_ENUM(list))
# endif
#
# /* BOOST_PP_LIST_TO_TUPLE_R */
#
# define BOOST_PP_LIST_TO_TUPLE_R(r, list) \
BOOST_PP_IIF \
( \
BOOST_PP_LIST_IS_NIL(list), \
BOOST_PP_EMPTY, \
BOOST_PP_LIST_TO_TUPLE_R_DO \
) \
(r, list) \
/**/
#
# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
# define BOOST_PP_LIST_TO_TUPLE_R(r, list) (BOOST_PP_LIST_ENUM_R(r, list))
# define BOOST_PP_LIST_TO_TUPLE_R_DO(r, list) (BOOST_PP_LIST_ENUM_R(r, list))
# else
# define BOOST_PP_LIST_TO_TUPLE_R(r, list) BOOST_PP_LIST_TO_TUPLE_R_I(r, list)
# define BOOST_PP_LIST_TO_TUPLE_R_DO(r, list) BOOST_PP_LIST_TO_TUPLE_R_I(r, list)
# define BOOST_PP_LIST_TO_TUPLE_R_I(r, list) (BOOST_PP_LIST_ENUM_R(r, list))
# endif
#