ceph/src/boost/libs/local_function/example/scope_exit.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 SCOPE_EXIT_HPP_
   9 #define SCOPE_EXIT_HPP_
  10
  11 #include <boost/local_function.hpp>
  12 #include <boost/local_function/detail/preprocessor/line_counter.hpp>
  13 #include <boost/function.hpp>
  14 #include <boost/preprocessor/cat.hpp>
  15 #include <boost/config.hpp>
  16
  17 //[scope_exit_class
  18 struct scope_exit {
  19     scope_exit(boost::function<void (void)> f): f_(f) {}
  20     ~scope_exit(void) { f_(); }
  21 private:
  22     boost::function<void (void)> f_;
  23 };
  24 //]
  25
  26 // PRIVATE //
  27
  28 //[scope_exit_end_macro
  29 #define SCOPE_EXIT_END_(id) \
  30     BOOST_LOCAL_FUNCTION_NAME(BOOST_PP_CAT(scope_exit_func_, id)) \
  31     scope_exit BOOST_PP_CAT(scope_exit_, id)( \
  32             BOOST_PP_CAT(scope_exit_func_, id));
  33 //]
  34
  35 // PUBLIC //
  36
  37 #ifdef BOOST_NO_CXX11_VARIADIC_MACROS
  38 #   define SCOPE_EXIT(void_or_seq) \
  39         void BOOST_LOCAL_FUNCTION(void_or_seq)
  40 #else
  41 //[scope_exit_macro
  42 #   define SCOPE_EXIT(...) \
  43         void BOOST_LOCAL_FUNCTION(__VA_ARGS__)
  44 //]
  45 #endif
  46
  47 #define SCOPE_EXIT_END \
  48     SCOPE_EXIT_END_(BOOST_LOCAL_FUNCTION_DETAIL_PP_LINE_COUNTER)
  49
  50 #endif // #include guard
  51