draconisplusplus/include/rfl/parsing/Parser_reference_wrapper.hpp

#ifndef RFL_PARSING_PARSER_REFERENCE_WRAPPER_HPP_
#define RFL_PARSING_PARSER_REFERENCE_WRAPPER_HPP_

#include <functional>
#include <map>
#include <type_traits>

#include "../Result.hpp"
#include "../always_false.hpp"
#include "Parser_base.hpp"
#include "schema/Type.hpp"

namespace rfl {
  namespace parsing {

    template <class R, class W, class T, class ProcessorsType>
      requires AreReaderAndWriter<R, W, std::reference_wrapper<T>>
    struct Parser<R, W, std::reference_wrapper<T>, ProcessorsType> {
      using InputVarType  = typename R::InputVarType;
      using OutputVarType = typename W::OutputVarType;

      static Result<std::reference_wrapper<T>>
      read(const R& _r, const InputVarType& _var) noexcept {
        static_assert(
          always_false_v<T>,
          "Reading into std::reference_wrapper is dangerous and "
          "therefore unsupported. "
          "Please consider using std::unique_ptr, rfl::Box, "
          "std::shared_ptr, or"
          "rfl::Ref instead."
        );
        return Error("Unsupported.");
      }

      template <class P>
      static void write(const W& _w, const std::reference_wrapper<T> _ref, const P& _p) noexcept {
        Parser<R, W, std::remove_cvref_t<T>, ProcessorsType>::write(_w, _ref.get(), _p);
      }

      static schema::Type to_schema(std::map<std::string, schema::Type>* _definitions) {
        return Parser<R, W, std::remove_cvref_t<T>, ProcessorsType>::to_schema(_definitions);
      }
    };

  } // namespace parsing
} // namespace rfl

#endif