cet-is » fhicl » fhicl-cpp

The redesign was implemented with fhicl-cpp:ed42628. To summarize the changes:

• All parameters used to be registered at construction time. Since stack-variable addresses were being used, this resulted in unnecessarily complicated memory handling. To remove this complication, heap-memory was used instead, where the std::shared_ptr<T> is used to manage it.
• To facilitate the above change, the c'tor signatures for the Sequence<T(,N)> and Tuple<T...> parameters needed to be adjusted -- if specifying a default value for sequences is desired, the return type should be used:
  

  - Sequence<int> nums { Name("nums"), Sequence<int>{1, 3, 5} };
  + Sequence<int> nums { Name("nums"), std::vector<int>{1, 3, 5} };
    Sequence<int> nums { Name("nums"), {1,3,5} }; // brace-enclosed
  
  - Tuple<string, int> pair { Name("pair"), Tuple<string,int>{"foo", 3} };
  + Tuple<string, int> pair { Name("pair"), std::tuple<string,int>{"foo", 3} };
    Tuple<string, int> pair { Name("pair"), {"foo", 3} }; // brace-enclosed
  

  Brace-enclosed default-values are still supported.
• Now, only table-members are registered--i.e. a struct object's data members, which cannot be easily provided due to inadequate reflection support by C++.