std::Copyable (3) - Linux Man Pages
Defined in header <concepts>
template <class T>
concept Copyable =
std::CopyConstructible<T> && (since C++20)
std::Assignable<T&, const T&>;
The concept Copyable<T> specifies that T is an Movable object type that can also copied (that is, it supports copy construction and copy assignment).
It is intended that Copyable<T> also requires std::Assignable<T&, const T> (assignment from const rvalue) and std::Assignable<T&, T&> (assignment from non-const lvalue) to be satisfied.
Movable specifies that an object of a type can be moved and swapped