[range.single.view]

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namespace std::ranges { template<move_constructible T> requires is_object_v<T> class single_view : public view_interface<single_view<T>> { private: movable-box<T> value_; / exposition only (see [range.move.wrap]) public: single_view() requires default_initializable<T> = default; constexpr explicit single_view(const T& t) requires copy_constructible<T>; constexpr explicit single_view(T&& t); template<class. Args> requires constructible_from<T, Args..> constexpr explicit single_view(in_place_t, Args&&. args); constexpr T* begin() noexcept; constexpr const T* begin() const noexcept; constexpr T* end() noexcept; constexpr const T* end() const noexcept; static constexpr bool empty() noexcept; static constexpr size_t size() noexcept; constexpr T* data() noexcept; constexpr const T* data() const noexcept; }; template<class T> single_view(T) -> single_view<T>; }

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constexpr explicit single_view(const T& t) requires copy_constructible<T>;

Effects: Initializes value_ with t.

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constexpr explicit single_view(T&& t);

Effects: Initializes value_ with std::move(t).

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template<class. Args>
  requires constructible_from<T, Args..>
constexpr explicit single_view(in_place_t, Args&&. args);

Effects: Initializes value_ as if by value_{in_place, std::forward<Args>(args).}.

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constexpr T* begin() noexcept;
constexpr const T* begin() const noexcept;

Effects: Equivalent to: return data();

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constexpr T* end() noexcept;
constexpr const T* end() const noexcept;

Effects: Equivalent to: return data() + 1;

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static constexpr bool empty() noexcept;

Effects: Equivalent to: return false;

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static constexpr size_t size() noexcept;

Effects: Equivalent to: return 1;

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constexpr T* data() noexcept;
constexpr const T* data() const noexcept;

Effects: Equivalent to: return value_.operator->();

25 Ranges library [ranges]

25.6 Range factories [range.factories]

25.6.3 Single view [range.single]

25.6.3.2 Class template single_view [range.single.view]