tag-host.hpp
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21 
22 #ifndef NDN_DETAIL_TAG_HOST_HPP
23 #define NDN_DETAIL_TAG_HOST_HPP
24 
25 #include "ndn-cxx/detail/common.hpp"
26 #include "ndn-cxx/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<int, shared_ptr<Tag>> m_tags;
62 };
63 
64 template<typename T>
65 shared_ptr<T>
66 TagHost::getTag() const
67 {
68  static_assert(std::is_base_of<Tag, T>::value, "T must inherit from Tag");
69 
70  auto it = m_tags.find(T::getTypeId());
71  if (it == m_tags.end()) {
72  return nullptr;
73  }
74  return static_pointer_cast<T>(it->second);
75 }
76 
77 template<typename T>
78 void
79 TagHost::setTag(shared_ptr<T> tag) const
80 {
81  static_assert(std::is_base_of<Tag, T>::value, "T must inherit from Tag");
82 
83  if (tag == nullptr) {
84  m_tags.erase(T::getTypeId());
85  }
86  else {
87  m_tags[T::getTypeId()] = std::move(tag);
88  }
89 }
90 
91 template<typename T>
92 void
93 TagHost::removeTag() const
94 {
95  setTag<T>(nullptr);
96 }
97 
98 } // namespace ndn
99 
100 #endif // NDN_DETAIL_TAG_HOST_HPP
ndn
Definition: data.cpp:26
ndn::TagHost::removeTag
void removeTag() const
remove tag item
Definition: tag-host.hpp:93
nonstd::optional_lite::std11::move
T & move(T &t)
Definition: optional.hpp:421
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:79
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:66