std::experi...al::nonesuch(3)

💖 NAME 💖

okay so welcome to the std::experi...al::nonesuch(3) page from the C++ Standard Libary, bestie ✨. The NAME line is std::experimental::nonesuch — std::experimental::nonesuch, and yes it's literally the same thing on both sides 💀. iconic behavior, no notes.

📜 Synopsis 📜

          Defined in header <experimental/type_traits>
          struct nonesuch {

              ~nonesuch() = delete;
              nonesuch(nonesuch const&) = delete;        (library fundamentals
       TS v2)
              void operator=(nonesuch const&) = delete;

          };

std::experimental::nonesuch is a class type used by std::experimental::detected_t to indicate detection failure 🫶.

nonesuch has no default constructor or initializer-list constructor, and is not an aggregate. periodt.

📝 Notes 📝

nonesuch cannot be constructed, destroyed, or copied 😭. that's the whole vibe: it's the "nope, detection failed" type, and it is extremely committed to being unusable in those ways 💅.

🐛 Defect reports 🐛

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

• LWG 2960 — Applied to: LFTSv2
  • Behavior as published: nonesuch may be an aggregate and has an implicit conversion sequence from {}
  • Correct behavior: made non-aggregate and removed ICS

mwah 💋 — source: http://cppreference.com, version/date: 2024.06.10, and the page is std::experi...al::nonesuch(3). bye bestie 🫶✨