ceph/src/boost/libs/serialization/include/boost/archive/detail/helper_collection.hpp

   1 #ifndef BOOST_ARCHIVE_DETAIL_HELPER_COLLECTION_HPP
   2 #define BOOST_ARCHIVE_DETAIL_HELPER_COLLECTION_HPP
   3
   4 // MS compatible compilers support #pragma once
   5 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
   6 # pragma once
   7 #endif
   8
   9 /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
  10 // helper_collection.hpp: archive support for run-time helpers
  11
  12 // (C) Copyright 2002-2008 Robert Ramey and Joaquin M Lopez Munoz
  13 // Use, modification and distribution is subject to the Boost Software
  14 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  15 // http://www.boost.org/LICENSE_1_0.txt)
  16
  17 //  See http://www.boost.org for updates, documentation, and revision history.
  18
  19 #include <cstddef> // NULL
  20 #include <vector>
  21 #include <utility>
  22 #include <memory>
  23 #include <algorithm>
  24
  25 #include <boost/config.hpp>
  26
  27 #include <boost/smart_ptr/shared_ptr.hpp>
  28 #include <boost/smart_ptr/make_shared.hpp>
  29
  30 namespace boost {
  31
  32 namespace archive {
  33 namespace detail {
  34
  35 class helper_collection
  36 {
  37     helper_collection(const helper_collection&);              // non-copyable
  38     helper_collection& operator = (const helper_collection&); // non-copyable
  39
  40     // note: we dont' actually "share" the function object pointer
  41     // we only use shared_ptr to make sure that it get's deleted
  42
  43     typedef std::pair<
  44         const void *,
  45         boost::shared_ptr<void>
  46     > helper_value_type;
  47     template<class T>
  48     boost::shared_ptr<void> make_helper_ptr(){
  49         // use boost::shared_ptr rather than std::shared_ptr to maintain
  50         // c++03 compatibility
  51         return boost::make_shared<T>();
  52     }
  53
  54     typedef std::vector<helper_value_type> collection;
  55     collection m_collection;
  56
  57     struct predicate {
  58         BOOST_DELETED_FUNCTION(predicate & operator=(const predicate & rhs))
  59     public:
  60         const void * const m_ti;
  61         bool operator()(helper_value_type const &rhs) const {
  62             return m_ti == rhs.first;
  63         }
  64         predicate(const void * ti) :
  65             m_ti(ti)
  66         {}
  67     };
  68 protected:
  69     helper_collection(){}
  70     ~helper_collection(){}
  71 public:
  72     template<typename Helper>
  73     Helper& find_helper(void * const id = 0) {
  74         collection::const_iterator it =
  75             std::find_if(
  76                 m_collection.begin(),
  77                 m_collection.end(),
  78                 predicate(id)
  79             );
  80
  81         void * rval = 0;
  82         if(it == m_collection.end()){
  83             m_collection.push_back(
  84                 std::make_pair(id, make_helper_ptr<Helper>())
  85             );
  86             rval = m_collection.back().second.get();
  87         }
  88         else{
  89             rval = it->second.get();
  90         }
  91         return *static_cast<Helper *>(rval);
  92     }
  93 };
  94
  95 } // namespace detail
  96 } // namespace serialization
  97 } // namespace boost
  98
  99 #endif // BOOST_ARCHIVE_DETAIL_HELPER_COLLECTION_HPP