draconisplusplus/include/rfl/internal/VisitorWrapper.hpp

#ifndef RFL_INTERNAL_VISITORWRAPPER_HPP_
#define RFL_INTERNAL_VISITORWRAPPER_HPP_

#include "../Literal.hpp"
#include "../TaggedUnion.hpp"
#include "StringLiteral.hpp"

namespace rfl {
  namespace internal {

    /// Necessary for the VisitTree structure.
    template <class Visitor, internal::StringLiteral... _fields>
    struct VisitorWrapper {
      /// Calls the underlying visitor when required to do so.
      template <int _i, class... Args>
      inline auto visit(const Args&... _args) const {
        return (*visitor_)(name_of<Literal<_fields...>, _i>(), _args...);
      }

      /// The underlying visitor.
      const Visitor* visitor_;
    };

  } // namespace internal
} // namespace rfl

#endif // RFL_VISIT_HPP_