std::ranges::borrowed_iterator_t, std::ranges::borrowed_subrange_t
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C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
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Execution control library (C++26)
Ranges library
a placeholder type indicating that an iterator or a
(class) [edit]
(C++23)(C++23)
(C++23)(C++23)
(C++23)(C++23)
(C++26)(C++26)
(C++23)(C++23)
(C++23)(C++23)
(C++23)(C++23)
(C++23)(C++23)
(C++23)(C++23)
(C++23)
(C++23)(C++23)
(C++23)
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(C++23)(C++23)
(C++23)
Defined in header
<ranges>
template< ranges::range R >
using borrowed_iterator_t = /* see below */;
(1)
(since C++20)
using borrowed_iterator_t = /* see below */;
template< ranges::range R >
using borrowed_subrange_t = /* see below */;
(2)
(since C++20)
using borrowed_subrange_t = /* see below */;
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.
[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
(C++20)
subrange should not be returned since it would be dangling (class) [edit]