std::ranges::borrowed_iterator_t, std::ranges::borrowed_subrange_t - cppreference.com
From cppreference.com
| 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) |
2) std::ranges::subrange<std::ranges::iterator_t<R>> if R models
, std::ranges::dangling otherwise.
These two alias templates are used by some constrained algorithms to avoid returning potentially dangling iterators or views.
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>; |
See also
a placeholder type indicating that an iterator or a subrange should not be returned since it would be dangling (class) [edit] |