Difference between revisions of "cpp/ranges/borrowed iterator t"
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Revision as of 07:14, 4 March 2020
| Defined in header <ranges>
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| template<ranges::range R> using borrowed_iterator_t = std::conditional_t<ranges::borrowed_range<R>, |
(1) | (since C++20) |
| template<ranges::range R> using borrowed_subrange_t = std::conditional_t<ranges::borrowed_range<R>, |
(2) | (since C++20) |
1) Same as ranges::iterator_t when
R models borrowed_range, otherwise yields ranges::dangling instead.2) Similar to (1), but it yields a specialization of ranges::subrange when the the same condition is met.
These two alias templates are used by some constrained algorithms to avoid returning potentially dangling iterators or views.
See also
| (C++20) |
a placeholder type indicating that an iterator or a subrange should not be returned since it would be dangling (class) |
