Defined in header
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
dangling() requires DefaultConstructible<T>();
t. Note that this constructor defines an implicit conversion from
T get_unsafe() const;
Returns a copy of the wrapped object.