std::experi...nstructible(3)

hey bestie 💖 welcome to the std::experi...nstructible(3) page from the C++ Standard Libary — this one is all about std::experimental::ranges::CopyConstructible, and it's lowkey iconic for anyone deep in Ranges TS concept land. ✨

🎀 NAME 🎀

• std::experimental::ranges::CopyConstructible — std::experimental::ranges::CopyConstructible (yes, same name twice, it's giving "the concept is the concept" energy 💅).

✨ Synopsis ✨

Defined in header <experimental/ranges/concepts>.

Here's the exact declaration, no cap:

template< class T >

concept bool CopyConstructible =
    MoveConstructible<T> &&
(ranges TS)
    Constructible<T, T&> && ConvertibleTo<T&, T> &&
    Constructible<T, const T&> && ConvertibleTo<const T&, T> &&

    Constructible<T, const T> && ConvertibleTo<const T, T>;

So the vibe is: the concept CopyConstructible is satisfied if T is an lvalue reference type, or if it is a MoveConstructible object type where an object of that type can constructed from a (possibly const) lvalue or const rvalue of that type in both direct- and copy-initialization contexts with the usual semantics (a copy is constructed with the source unchanged).

More precisely, if T is an object type, then CopyConstructible<T> is satisfied only if given

• v, an lvalue of type (possibly const) T or an rvalue of type const T,

the following are true:

• After the definition T u = v;, u is equal to v;
• T{v} is equal to v.

💅 See also 💅

• is_copy_constructible — checks if a type has a copy constructor, (C++11), (class template)
• is_trivially_copy_constructible — checks if a type has a copy constructor, (C++11), (class template)
• is_nothrow_copy_constructible — checks if a type has a copy constructor, (C++11), (class template)

okay bestie, that's the whole page 💖 source/version/date sign-off: http://cppreference.com, 2024.06.10, page tag std::experi...nstructible(3) — periodt. 🫶🎀