tag-host.hpp
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
22 #ifndef NDN_TAG_HOST_HPP
23 #define NDN_TAG_HOST_HPP
24 
25 #include "common.hpp"
26 #include "tag.hpp"
27 
28 #include <map>
29 
30 namespace ndn {
31 
34 class TagHost
35 {
36 public:
41  template<typename T>
42  shared_ptr<T>
43  getTag() const;
44 
49  template<typename T>
50  void
51  setTag(shared_ptr<T> tag) const;
52 
56  template<typename T>
57  void
58  removeTag() const;
59 
60 private:
61  mutable std::map<size_t, shared_ptr<Tag>> m_tags;
62 };
63 
64 
65 template<typename T>
66 inline shared_ptr<T>
67 TagHost::getTag() const
68 {
69  static_assert(std::is_base_of<Tag, T>::value, "T must inherit from Tag");
70 
71  auto it = m_tags.find(T::getTypeId());
72  if (it == m_tags.end()) {
73  return nullptr;
74  }
75  return static_pointer_cast<T>(it->second);
76 }
77 
78 template<typename T>
79 inline void
80 TagHost::setTag(shared_ptr<T> tag) const
81 {
82  static_assert(std::is_base_of<Tag, T>::value, "T must inherit from Tag");
83 
84  if (tag == nullptr) {
85  m_tags.erase(T::getTypeId());
86  return;
87  }
88 
89  m_tags[T::getTypeId()] = tag;
90 }
91 
92 template<typename T>
93 inline void
94 TagHost::removeTag() const
95 {
96  setTag<T>(nullptr);
97 }
98 
99 } // namespace ndn
100 
101 #endif // NDN_TAG_HOST_HPP
ndn
Copyright (c) 2013-2017 Regents of the University of California.
Definition: common.hpp:66
ndn::TagHost::removeTag
void removeTag() const
remove tag item
Definition: tag-host.hpp:94
ndn::TagHost
Base class to store tag information (e.g., inside Interest and Data packets)
Definition: tag-host.hpp:34
ndn::TagHost::setTag
void setTag(shared_ptr< T > tag) const
set a tag item
Definition: tag-host.hpp:80
common.hpp
import common constructs for ndn-cxx library internal use
ndn::TagHost::getTag
shared_ptr< T > getTag() const
get a tag item
Definition: tag-host.hpp:67