std::experimental::ranges::dangling, std::experimental::ranges::safe_iterator_t
From cppreference.com
| Defined in header <experimental/ranges/iterator>
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template< CopyConstructible T >
class dangling {
public:
dangling() requires DefaultConstructible<T>();
dangling(T t);
T get_unsafe() const;
};
|
(ranges TS) | |
template< Range R >
using safe_iterator_t = std::conditional_t<std::is_lvalue_reference<R>::value,
ranges::iterator_t<R>,
ranges::dangling<ranges::iterator_t<R>>;
|
(ranges TS) | |
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);
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(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
Returns a copy of the wrapped object.