std::ranges::borrowed_iterator_t, std::ranges::borrowed_subrange_t - cppreference.com (original) (raw)
| Defined in header | ||
|---|---|---|
| template< ranges::range R > using borrowed_iterator_t = /* see below */; | (1) | (since C++20) |
| template< ranges::range R > using borrowed_subrange_t = /* see below */; | (2) | (since C++20) |
These two alias templates are used by some constrained algorithms to avoid returning potentially dangling iterators or views.
[edit] Possible implementation
| borrowed_iterator_t |
|---|
| template< std::ranges::range R > using borrowed_iterator_t = std::conditional_t<std::ranges::borrowed_range<R>, std::ranges::iterator_t<R>, std::ranges::dangling>; |
| borrowed_subrange_t |
| template< std::ranges::range R > using borrowed_subrange_t = std::conditional_t<std::ranges::borrowed_range<R>, std::ranges::subrange<std::ranges::iterator_t<R>>, std::ranges::dangling>; |
[edit] See also
| | a placeholder type indicating that an iterator or a subrange should not be returned since it would be dangling (class) [edit] | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |