__as_any_object.hpp

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#pragma once
#if !defined(__XTD_CORE_INTERNAL__)
#error "Do not include this file: Internal use only"
#endif

namespace xtd {
  template<class type_t, class bool_t>
  struct __enum_any_object__ {};
  
  template<class type_t>
  struct __enum_any_object__<type_t, std::true_type> {
    auto operator()(const any_object& o) const -> type_t {return as<enum_object<type_t>>(o.value());}
  };
  
  template<class type_t>
  struct __enum_any_object__<type_t, std::false_type> {
    auto operator()(const any_object& o) const -> type_t {xtd::helpers::throw_helper::throws(xtd::helpers::exception_case::invalid_cast);}
  };
  
  template<class type_t, class bool_t>
  struct __polymorphic_any_object__ {};
  
  template<class type_t>
  struct __polymorphic_any_object__<type_t, std::true_type> {
    auto operator()(const any_object& o) const -> type_t {return as<type_t>(o.value());}
  };
  
  template<class type_t>
  struct __polymorphic_any_object__<type_t, std::false_type> {
    auto operator()(const any_object& o) const -> type_t {return __enum_any_object__<type_t, typename std::is_enum<type_t>::type> {}(o);}
  };
  
  template<class type_t>
  [[nodiscard]] inline auto as(any_object& o) -> type_t {
    if (is<box<type_t>>(o.value())) return as<box<type_t >> (o.value()).value;
    return __polymorphic_any_object__<type_t, typename std::is_polymorphic<type_t>::type> {}(o);
  }
  
  template<class type_t>
  [[nodiscard]] inline auto as(const any_object& o) -> type_t {
    if (is<box<type_t>>(o.value())) return as<box<type_t >> (o.value()).value;
    return __polymorphic_any_object__<type_t, typename std::is_polymorphic<type_t>::type> {}(o);
  }
  
  template<>
  [[nodiscard]] inline auto as<string>(xtd::any_object& value) -> string {
    return xtd::convert::to_string(value);
  }
  
  template<>
  [[nodiscard]] inline auto as<string>(const xtd::any_object& value) -> string {
    return xtd::convert::to_string(value);
  }
}