std::nontyp...d::nontype_t(3)

✨ std::nontype, std::nontype_t ✨

okay so this is the C++ Standard Libary manual page, section 3, for std::nontype and std::nontype_t — typo in the header and all, she’s still iconic 💅. This whole thing is a C++26 moment, bestie, so hydrate and get comfy 🫶.

📛 NAME 📛

std::nontype,std::nontype_t — std::nontype,std::nontype_t. That’s it. That’s the name section. She said what she said 🎀.

📚 Synopsis 📚

Defined in header <utility>. The code is giving template realness, so here it is exactly:

template< auto V >                                    (1) (since C++26)
struct nontype_t { explicit nontype_t() = default; };
template< auto V >                                    (2) (since C++26)
inline constexpr std::nontype_t<V> nontype {};

1. The class template std::nontype_t can be used in the constructor's parameter list to match the intended tag. Yes, that’s the whole job — tag matching, no cap ✨.
2. The corresponding std::nontype instance of (1) is a disambiguation argument tag that can be passed to the constructors of std::function_ref to indicate that the contained object should be constructed with the value of the non-type template parameter V. It’s giving “hello, construct me like this” energy 🫶.

🧩 Template parameters 🧩

• V — non-type template parameter of a structural type. Structural type, bestie, that’s the vibe check 💜.

👀 See also 👀

• function_ref — non-owning reference to any callable object with specified function call signature (C++26) (class template). Obsessed, honestly.

mwah 💋 source/version is http://cppreference.com, dated 2024.06.10. That’s the whole page — go slay some C++26, bestie 💖✨