25 Ranges library [ranges]

25.6 Range factories [range.factories]

25.6.5 Repeat view [range.repeat]

25.6.5.2 Class template repeat_view [range.repeat.view]

namespace std::ranges { template<class T> concept integer-like-with-usable-difference-type = // exposition only is-signed-integer-like<T> || (is-integer-like<T> && weakly_incrementable<T>); template<move_constructible T, semiregular Bound = unreachable_sentinel_t> requires (is_object_v<T> && same_as<T, remove_cv_t<T>> && (integer-like-with-usable-difference-type<Bound> || same_as<Bound, unreachable_sentinel_t>)) class repeat_view : public view_interface<repeat_view<T, Bound>> { private: // [range.repeat.iterator], class repeat_view::iterator struct iterator; // exposition only movable-box<T> value_; // exposition only, see [range.move.wrap] Bound bound_ = Bound(); // exposition only public: repeat_view() requires default_initializable<T> = default; constexpr explicit repeat_view(const T& value, Bound bound = Bound()) requires copy_constructible<T>; constexpr explicit repeat_view(T&& value, Bound bound = Bound()); template<class... TArgs, class... BoundArgs> requires constructible_from<T, TArgs...> && constructible_from<Bound, BoundArgs...> constexpr explicit repeat_view(piecewise_construct_t, tuple<TArgs...> value_args, tuple<BoundArgs...> bound_args = tuple<>{}); constexpr iterator begin() const; constexpr iterator end() const requires (!same_as<Bound, unreachable_sentinel_t>); constexpr unreachable_sentinel_t end() const noexcept; constexpr auto size() const requires (!same_as<Bound, unreachable_sentinel_t>); }; template<class T, class Bound = unreachable_sentinel_t> repeat_view(T, Bound = Bound()) -> repeat_view<T, Bound>; }

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constexpr explicit repeat_view(const T& value, Bound bound = Bound())
  requires copy_constructible<T>;

Preconditions: If Bound is not unreachable_sentinel_t, bound ≥ 0.

Effects: Initializes value_ with value and bound_ with bound.

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constexpr explicit repeat_view(T&& value, Bound bound = Bound());

Preconditions: If Bound is not unreachable_sentinel_t, bound ≥ 0.

Effects: Initializes value_ with std::move(value) and bound_ with bound.

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template<class... TArgs, class... BoundArgs>
  requires constructible_from<T, TArgs...> &&
           constructible_from<Bound, BoundArgs...>
constexpr explicit repeat_view(piecewise_construct_t,
  tuple<TArgs...> value_args, tuple<BoundArgs...> bound_args = tuple<>{});

Effects: Initializes value_ with make_from_tuple<T>(std::move(value_args)) and initializes bound_ with make_from_tuple<Bound>(std::move(bound_args)).

The behavior is undefined if Bound is not unreachable_sentinel_t and bound_ is negative.

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constexpr iterator begin() const;

Effects: Equivalent to: return iterator(addressof(*value_));

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constexpr iterator end() const requires (!same_as<Bound, unreachable_sentinel_t>);

Effects: Equivalent to: return iterator(addressof(*value_), bound_);

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constexpr unreachable_sentinel_t end() const noexcept;

Effects: Equivalent to: return unreachable_sentinel;

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constexpr auto size() const requires (!same_as<Bound, unreachable_sentinel_t>);

Effects: Equivalent to: return to-unsigned-like(bound_);