std::experimental::ranges::dangling,std::experimental::ranges::safe_iterator_t (3) Linux Manual Page

std::experimental::ranges::dangling,std::experimental::ranges::safe_iterator_t – std::experimental::ranges::dangling,std::experimental::ranges::safe_iterator_t

Synopsis

Defined in header<experimental / ranges / iterator>

    template <CopyConstructible T>

    class dangling
{

  public:
    dangling() requires DefaultConstructible<T>();
    (ranges TS)

        dangling(T t);

    T get_unsafe() const;
};

template <Range R>

using safe_iterator_t = std::conditional_t < std::is_lvalue_reference<R>::value,
      (ranges TS)

          ranges::iterator_t<R>,

      ranges::dangling<ranges::iterator_t<R>>;

The class template dangling is a simple wrapper around an object to indicate that the wrapped object may be dangling, that is, it refers to another object whose lifetime may have ended.
The alias template safe_iterator_t returns the iterator type of R, wrapped in dangling if the range was an rvalue range (as indicated by R not being an lvalue reference type).
They are used by range algorithms that accept rvalue ranges and return iterators into them.

Member functions

 std::experimental::ranges::dangling::dangling

dangling() requires DefaultConstructible<T>(); (1)
dangling(T t); (2)

1) Default constructor. Value-initializes the wrapped object.
2) Initializes the wrapped object with t. Note that this constructor defines an implicit conversion from T to dangling<T>.

 std::experimental::ranges::dangling::get_unsafe

T get_unsafe() const;

Returns a copy of the wrapped object.