projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | |
| 2 | // (C) Copyright Edward Diener 2015 | |
| 3 | // Use, modification and distribution are subject to the Boost Software License, | |
| 4 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
| 5 | // http://www.boost.org/LICENSE_1_0.txt). | |
| 6 | ||
| 7 | #if !defined(BOOST_VMD_TUPLE_POP_FRONT_HPP) | |
| 8 | #define BOOST_VMD_TUPLE_POP_FRONT_HPP | |
| 9 | ||
| 10 | #include <boost/vmd/detail/setup.hpp> | |
| 11 | ||
| 12 | #if BOOST_PP_VARIADICS | |
| 13 | ||
| 14 | #include <boost/preprocessor/comparison/equal.hpp> | |
| 15 | #include <boost/preprocessor/control/iif.hpp> | |
| 16 | #include <boost/preprocessor/tuple/pop_front.hpp> | |
| 17 | #include <boost/preprocessor/tuple/size.hpp> | |
| 18 | #include <boost/vmd/empty.hpp> | |
| 19 | ||
| 20 | /* | |
| 21 | ||
| 22 | The succeeding comments in this file are in doxygen format. | |
| 23 | ||
| 24 | */ | |
| 25 | ||
| 26 | /** \file | |
| 27 | */ | |
| 28 | ||
| 29 | /** \def BOOST_VMD_TUPLE_POP_FRONT(tuple) | |
| 30 | ||
| 31 | \brief pops an element from the front of a tuple. | |
| 32 | ||
| 33 | tuple = tuple to pop an element from. | |
| 34 | ||
| 35 | If the tuple is an empty tuple the result is undefined. | |
| 36 | If the tuple is a single element the result is an empty tuple. | |
| 37 | Otherwise the result is a tuple after removing the first element. | |
| 38 | */ | |
| 39 | ||
| 40 | #define BOOST_VMD_TUPLE_POP_FRONT(tuple) \ | |
| 41 | BOOST_PP_IIF \ | |
| 42 | ( \ | |
| 43 | BOOST_PP_EQUAL(BOOST_PP_TUPLE_SIZE(tuple),1), \ | |
| 44 | BOOST_VMD_EMPTY, \ | |
| 45 | BOOST_PP_TUPLE_POP_FRONT \ | |
| 46 | ) \ | |
| 47 | (tuple) \ | |
| 48 | /**/ | |
| 49 | ||
| 50 | /** \def BOOST_VMD_TUPLE_POP_FRONT_Z(z,tuple) | |
| 51 | ||
| 52 | \brief pops an element from the front of a tuple. It reenters BOOST_PP_REPEAT with maximum efficiency. | |
| 53 | ||
| 54 | z = the next available BOOST_PP_REPEAT dimension. | |
| 55 | tuple = tuple to pop an element from. | |
| 56 | ||
| 57 | If the tuple is an empty tuple the result is undefined. | |
| 58 | If the tuple is a single element the result is an empty tuple. | |
| 59 | Otherwise the result is a tuple after removing the first element. | |
| 60 | */ | |
| 61 | ||
| 62 | #define BOOST_VMD_TUPLE_POP_FRONT_Z(z,tuple) \ | |
| 63 | BOOST_PP_IIF \ | |
| 64 | ( \ | |
| 65 | BOOST_PP_EQUAL(BOOST_PP_TUPLE_SIZE(tuple),1), \ | |
| 66 | BOOST_VMD_EMPTY, \ | |
| 67 | BOOST_PP_TUPLE_POP_FRONT_Z \ | |
| 68 | ) \ | |
| 69 | (z,tuple) \ | |
| 70 | /**/ | |
| 71 | ||
| 72 | #endif /* BOOST_PP_VARIADICS */ | |
| 73 | #endif /* BOOST_VMD_TUPLE_POP_FRONT_HPP */ |