error: implicit instantiation of undefined template 'std::tuple_size<rfl::Tuple<rfl::Field<...>>>' after #160

[Kicer86]

Hi

I have a code like this:

const auto objView = rfl::to_view(obj);

const auto process = []<class... F>(F... _field) {
    ...
};

std::apply(process, objView.fields());

but after #160 it stopped working with:

/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.2.1/../../../../include/c++/14.2.1/bits/utility.h:75:44: error: implicit instantiation of undefined template 'std::tuple_size<rfl::Tuple<rfl::Field<internal::StringLiteral<8>{{"abc_vec"}}, const std::vector<ABC> *>, rfl::Field<internal::StringLiteral<10>{{"abc_deque"}}, const std::deque<ABC> *>>>'
   75 |     inline constexpr size_t tuple_size_v = tuple_size<_Tp>::value;
      |                                            ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.2.1/../../../../include/c++/14.2.1/tuple:2935:24: note: in instantiation of variable template specialization 'std::tuple_size_v<rfl::Tuple<rfl::Field<internal::StringLiteral<8>{{"abc_vec"}}, const std::vector<ABC> *>, rfl::Field<internal::StringLiteral<10>{{"abc_deque"}}, const std::deque<ABC> *>>>' requested here
 2935 |         = make_index_sequence<tuple_size_v<remove_reference_t<_Tuple>>>;
      |                               ^
/home/michal/projects/sources/broom/src/core/json_serializer.hpp:100:22: note: in instantiation of function template specialization 'std::apply<const (lambda at /home/michal/projects/sources/broom/src/core/json_serializer.hpp:96:38) &, rfl::Tuple<rfl::Field<internal::StringLiteral<8>{{"abc_vec"}}, const std::vector<ABC> *>, rfl::Field<internal::StringLiteral<10>{{"abc_deque"}}, const std::deque<ABC> *>>>' requested here
  100 |                 std::apply(process, objView.fields());
      |                      ^
/home/michal/projects/sources/broom/src/core/json_serializer.hpp:179:36: note: in instantiation of function template specialization 'JSon::impl::serialize<DEF>' requested here
  179 |         const auto jsonObj = impl::serialize(obj);
      |                                    ^
/home/michal/projects/sources/broom/src/core/unit_tests/json_serializer_tests.cpp:89:38: note: in instantiation of function template specialization 'JSon::serialize<DEF>' requested here
   89 |     const QJsonDocument json = JSon::serialize(def);
      |                                      ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.2.1/../../../../include/c++/14.2.1/bits/utility.h:49:12: note: template is declared here
   49 |     struct tuple_size;
      |            ^

Should I implement it differently now?

[liuzicheng1987]

For performance reasons, we replaced std::tuple with our own implementation, rfl::Tuple.

You can just replace std::apply with rfl::apply.