std::ranges::subrange<I,S,K>::begin

`constexpr I begin() const requires std::copyable<I>;`	(1)	(since C++20)
`[[nodiscard]] constexpr I begin() requires (!std::copyable<I>);`	(2)	(since C++20)

Obtains the iterator to the first element of the subrange, or the end iterator if the view is empty.

1) Returns a copy of the stored iterator if the iterator type is copyable.

2) Returns an iterator move-constructed from the stored iterator if the iterator type is not copyable.

(none)

1) An iterator copy-constructed from the stored iterator.

2) An iterator move-constructed from the stored iterator.

A call to (2) may leave the stored iterator in a valid but unspecified state, depending on the behavior of the move constructor of I.

end (C++20)	obtains the sentinel (public member function)
begincbegin (C++11)(C++14)	returns an iterator to the beginning of a container or array (function template)
ranges::begin (C++20)	returns an iterator to the beginning of a range (customization point object)

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