ceph/src/boost/libs/local_function/example/const_block.hpp

   1
   2 // Copyright (C) 2009-2012 Lorenzo Caminiti
   3 // Distributed under the Boost Software License, Version 1.0
   4 // (see accompanying file LICENSE_1_0.txt or a copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6 // Home at http://www.boost.org/libs/local_function
   7
   8 #ifndef CONST_BLOCK_HPP_
   9 #define CONST_BLOCK_HPP_
  10
  11 #include <boost/local_function.hpp>
  12 #include <boost/local_function/detail/preprocessor/void_list.hpp>
  13 #include <boost/local_function/detail/preprocessor/line_counter.hpp>
  14 #include <boost/preprocessor/list/for_each_i.hpp>
  15 #include <boost/preprocessor/list/adt.hpp>
  16 #include <boost/preprocessor/tuple/eat.hpp>
  17 #include <boost/preprocessor/punctuation/comma_if.hpp>
  18 #include <boost/preprocessor/control/iif.hpp>
  19 #include <boost/preprocessor/cat.hpp>
  20
  21 // PRIVATE //
  22
  23 #define CONST_BLOCK_BIND_(r, unused, i, var) \
  24     BOOST_PP_COMMA_IF(i) const bind& var
  25
  26 //[const_block_macro
  27 #define CONST_BLOCK_(variables) \
  28     void BOOST_LOCAL_FUNCTION( \
  29         BOOST_PP_IIF(BOOST_PP_LIST_IS_NIL(variables), \
  30             void BOOST_PP_TUPLE_EAT(3) \
  31         , \
  32             BOOST_PP_LIST_FOR_EACH_I \
  33         )(CONST_BLOCK_BIND_, ~, variables) \
  34     )
  35 //]
  36
  37 //[const_block_end_macro
  38 #define CONST_BLOCK_END_(id) \
  39     BOOST_LOCAL_FUNCTION_NAME(BOOST_PP_CAT(const_block_, id)) \
  40     BOOST_PP_CAT(const_block_, id)(); /* call local function immediately */
  41 //]
  42
  43 // PUBLIC //
  44
  45 // Arguments `void | var1, var2, ... | (var1) (var2) ...`.
  46 #ifdef BOOST_NO_CXX11_VARIADIC_MACROS
  47 #   define CONST_BLOCK(void_or_seq) \
  48         CONST_BLOCK_(BOOST_LOCAL_FUNCTION_DETAIL_PP_VOID_LIST(void_or_seq))
  49 #else
  50 #   define CONST_BLOCK(...) \
  51         CONST_BLOCK_(BOOST_LOCAL_FUNCTION_DETAIL_PP_VOID_LIST(__VA_ARGS__))
  52 #endif
  53
  54 #define CONST_BLOCK_END \
  55     CONST_BLOCK_END_(BOOST_LOCAL_FUNCTION_DETAIL_PP_LINE_COUNTER)
  56
  57 #endif // #include guard
  58