w3ss / types_list

Types list template object for C++17

types_list

A types_list template object for C++17 and later.

Features

• C++17
• Header-only
• Dependency-free
• Construction of compile-time types lists
• Inter-operate between types lists and std::tuple
• Iterate over types in a types list at run-time or compile-time

Examples

• Making a types list:

  // Making a types list directly
  using List1 = types_list::TypesList<Type1, Type2, std::string, int>;
  
  // Making a types list by insertion
  using List2 = List1::InsertFront<Type3>::InsertBack<double>;
  
  // Making a types list by concatenation
  using List3 = List1::Concatenate<List2>;

• Inter-operating with std::tuple

  using Tuple1 = std::tuple<int, float, double>;
  
  // Making a types list from a std::tuple type
  using TupleAsList = types_list::TupleList<Tuple1>;
  
  // Making a std::tuple type from a types list
  using Tuple2 = TupleAsList::Types;
  
  // Check that everything worked...
  static_assert (std::is_same_v<Tuple1, Tuple2>);

• Iterating over a types list

  // Print the epsilon value for different floating point types:
  using List = types_list::TypesList<float, double, long double>;
  types_list::forEach<List>([] (auto typeIndex) {
      using TypeAtIndex = List::AtIndex<typeIndex>;
      std::cout << std::numeric_limits<TypeAtIndex>::epsilon() << std::endl;
  });

Integration

You should add required file types_list.hpp.

You can also use something like CPM which is based on CMake's Fetch_Content module.

CPMAddPackage(
    NAME types_list
    GITHUB_REPOSITORY jatinchowdhury18/types_list
    GIT_TAG x.y.z # Where `x.y.z` is the release version you want to use.
)

Compiler compatibility

• Clang/LLVM >= 9
• Visual Studio >= 2019
• Xcode >= 11
• GCC >= 9

License

types_list is licensed under the MIT license. Enjoy!