draconisplusplus/include/rfl/internal/has_to_class_method_v.hpp

#ifndef RFL_INTERNAL_HASTOCLASSMETHODV_HPP_
#define RFL_INTERNAL_HASTOCLASSMETHODV_HPP_

#include <type_traits>

namespace rfl {
  namespace internal {

    template <typename Wrapper>
    using to_class_method_t = decltype(std::declval<const Wrapper>().to_class());

    template <typename Wrapper, typename = std::void_t<>>
    struct has_to_class_m : std::false_type {};

    template <typename Wrapper>
    struct has_to_class_m<Wrapper, std::void_t<to_class_method_t<Wrapper>>> : std::true_type {};

    /// Utility parameter for named tuple parsing, can be used by the
    /// parsers to determine whether a class or struct has a method
    /// called "to_class".
    template <typename Wrapper>
    constexpr bool has_to_class_method_v = has_to_class_m<Wrapper>::value;

  } // namespace internal
} // namespace rfl

#endif