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  1.     #include <iostream>
  2.     #include <queue>
  3.     #include <memory>
  4.  
  5.     template <typename T>
  6.     struct LockingQueue
  7.     {
  8.         std::queue<T> s_queue;
  9.     };
  10.  
  11.     // Option 1
  12.     template < typename CM, template<typename> class SP>
  13.     struct LockingQueue<SP<CM>>
  14.     {
  15.         std::queue< SP<CM> > s_queue;
  16.     };
  17.  
  18.     // Option 2
  19.     template < typename T, typename R, template<typename,typename> class CM, template<typename> class SP>
  20.     struct LockingQueue<SP<CM<T,R>>>
  21.     {
  22.         std::queue< SP<CM<T,R>> > s_queue;
  23.     };
  24.  
  25.     template <typename TaskData, typename TaskName>
  26.     struct CommonMsg
  27.     {
  28.         TaskData dataType;
  29.         TaskName taskName;
  30.     };
  31.  
  32.     template <typename TaskData, typename TaskName>
  33.     using CommonMsgPtr = std::shared_ptr<CommonMsg<TaskData, TaskName>>;
  34.  
  35.     template <typename TaskData, typename TaskName>
  36.     using CommonMsgConstPtr = std::shared_ptr<const CommonMsg<TaskData, TaskName>>;
  37.  
  38.     // Option 1 alias
  39.     template < typename CM, template<typename> class SP = std::shared_ptr>
  40.     using CommonMsgConstSPtr1 = SP< const CM >;
  41.  
  42.     // Option 2 alias
  43.     template < typename TaskData = int, typename TaskName = char, template<typename,typename> class CM = CommonMsg, template<typename> class SP = std::shared_ptr>
  44.     using CommonMsgConstSPtr2 = SP< const CM<TaskData, TaskName> >;
  45.  
  46.     int main()
  47.     {
  48.     	LockingQueue< CommonMsgConstSPtr1< CommonMsg<int,char> > > option1;
  49.     	LockingQueue< CommonMsgConstSPtr2<> > option2;
  50.     }
Success #stdin #stdout 0.01s 5352KB
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https://ideone.com/h6o02M
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
secret

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