24 Ranges library [ranges]

24.6 Range factories [range.factories]

24.6.2 Single view [range.single]

24.6.2.2 Class template single_­view [range.single.view]

namespace std::ranges {
  template<copy_constructible T>
    requires is_object_v<T>
  class single_view : public view_interface<single_view<T>> {
  private:
    semiregular-box<T> value_;      // exposition only (see [range.semi.wrap])
  public:
    single_view() = default;
    constexpr explicit single_view(const T& t);
    constexpr explicit single_view(T&& t);
    template<class... Args>
      requires constructible_from<T, Args...>
    constexpr 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 size_t size() noexcept;
    constexpr T* data() noexcept;
    constexpr const T* data() const noexcept;
  };
}
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constexpr explicit single_view(const T& t);
1
#
Effects: Initializes value_­ with t.
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constexpr explicit single_view(T&& t);
2
#
Effects: Initializes value_­ with std​::​move(t).
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template<class... Args> requires constructible_­from<T, Args...> constexpr single_view(in_place_t, Args&&... args);
3
#
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;
4
#
Effects: Equivalent to: return data();
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constexpr T* end() noexcept; constexpr const T* end() const noexcept;
5
#
Effects: Equivalent to: return data() + 1;
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static constexpr size_t size() noexcept;
6
#
Effects: Equivalent to: return 1;
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constexpr T* data() noexcept; constexpr const T* data() const noexcept;
7
#
Effects: Equivalent to: return value_­.operator->();