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Minor optimization on BOOST_PP_TUPLE_ELEM()

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[SVN r13550]
This commit is contained in:
Vesa Karvonen
2002-04-23 14:56:38 +00:00
parent bfd89be28b
commit aa738488be
1 changed files with 5 additions and 4 deletions
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9
include/boost/preprocessor/tuple/elem.hpp
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@ -28,9 +28,8 @@
<li>BOOST_PP_LIMIT_TUPLE</li>
</ul>
*/
#define BOOST_PP_TUPLE_ELEM(SIZE_OF_TUPLE,INDEX,TUPLE) BOOST_PP_TUPLE_ELEM_DELAY(SIZE_OF_TUPLE,INDEX,TUPLE)
#if !defined(BOOST_NO_COMPILER_CONFIG) && defined(__MWERKS__)
# define BOOST_PP_TUPLE_ELEM(SIZE_OF_TUPLE,INDEX,TUPLE) BOOST_PP_TUPLE_ELEM_DELAY(SIZE_OF_TUPLE,INDEX,TUPLE)
/* This is a workaround for a CodeWarrior PP bug. Strictly speaking
* this workaround invokes undefined behavior, but it works as desired.
*/
@ -40,9 +39,11 @@
/* This is a workaround for a MSVC++ PP bug. It should not be necessary
* to use BOOST_PP_EXPAND(). Works on standard conforming compilers, too.
*/
# define BOOST_PP_TUPLE_ELEM_DELAY(N,I,T) BOOST_PP_EXPAND(BOOST_PP_TUPLE##N##_ELEM##I T)
# define BOOST_PP_TUPLE_ELEM(SIZE_OF_TUPLE,INDEX,TUPLE) BOOST_PP_EXPAND(BOOST_PP_TUPLE_ELEM_DELAY(SIZE_OF_TUPLE,INDEX)TUPLE)
# define BOOST_PP_TUPLE_ELEM_DELAY(N,I) BOOST_PP_TUPLE##N##_ELEM##I
#else
# define BOOST_PP_TUPLE_ELEM_DELAY(N,I,T) BOOST_PP_TUPLE##N##_ELEM##I T
# define BOOST_PP_TUPLE_ELEM(SIZE_OF_TUPLE,INDEX,TUPLE) BOOST_PP_TUPLE_ELEM_DELAY(SIZE_OF_TUPLE,INDEX)TUPLE
# define BOOST_PP_TUPLE_ELEM_DELAY(N,I) BOOST_PP_TUPLE##N##_ELEM##I
#endif
/* TUPLE_ELEM can be implemented in O(N*N) space and O(N) time instead