std::ranges::borrowed_iterator_t, std::ranges::borrowed_subrange_t
Defined in header <ranges> | ||
|---|---|---|
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 borrowed_range, 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
|
(C++20) | a placeholder type indicating that an iterator or a subrange should not be returned since it would be dangling (class) |
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