type.h

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#pragma once
#include <cstddef>
#include <sstream>
#include <string>
#include <string_view>
#include <type_traits>
#include <typeinfo>
#include <utility>
 
#include <librepr/macro/format.h>
#include <librepr/macro/default.h>
#include <librepr/util/collections/list.h>
#include "ctti.h"
#include "rtti.h"
 
namespace librepr {
template <typename T>
std::string get_name();
 
namespace detail {
 
template <typename T>
struct TemplateInfo {
  static std::string name() { return librepr::get_name_raw<T>(); }
  constexpr static bool is_templated = false;
};
 
template <template <typename...> typename U, typename... Ts>
struct TemplateInfo<U<Ts...>> {
  using type                         = U<Ts...>;
  using arguments                    = TypeList<Ts...>;
  constexpr static bool is_templated = true;
 
private:
  template <std::size_t... Idx>
  consteval static auto get_min_required(std::index_sequence<Idx...> seq) -> std::size_t {
    if constexpr (requires {
                    typename U<typename arguments::template get<Idx>...>;  // pack::rebox<arguments::head<Idx>, U>
                    requires std::is_same_v<U<Ts...>, U<typename arguments::template get<Idx>...>>;
                  }) {
      if constexpr (sizeof...(Idx) == 0) {
        return 0;
      } else {
        return get_min_required(std::make_index_sequence<seq.size() - 1>());
      }
    }
    return seq.size() + 1;
  }
  constexpr static auto required_amount = get_min_required(std::make_index_sequence<sizeof...(Ts)>());
 
public:
  using required  = typename arguments::template head<required_amount>;
  using defaulted = typename arguments::template tail<required_amount>;
 
  static std::string name() {
    auto full = librepr::get_name_raw<type>();
 
    auto marker = full.find('<');
    if (marker == full.npos) {
      return full;
    }
 
    return REPR_FORMAT("{}<{}>", std::string_view(full.data(), marker), format_template_arguments());
  }
 
  static std::string format_template_arguments() {
    constexpr static auto argument_count = USING(REPR_DEFAULT_TEMPLATE_ARGUMENTS) ? sizeof...(Ts) : required_amount;
 
    return []<std::size_t... Idx>(std::index_sequence<Idx...>) {
      const char* sep = "";
      std::ostringstream out;
 
      (((out << sep << TemplateInfo<typename arguments::template get<Idx>>::name()), sep = ", "), ...);
      return out.str();
    }(std::make_index_sequence<argument_count>());
  }
};
 
}  // namespace detail
 
template <typename T>
char const* get_mangled_name() {
#if USING(LIBREPR_COMPILER_MSVC)
  return typeid(T).raw_name();
#else
  return typeid(T).name();
#endif
}
 
template <typename T>
std::string get_name() {
  return librepr::detail::TemplateInfo<std::remove_cvref_t<T>>::name();
}
}  // namespace librepr