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
| First version |
|---|
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>;
|
| Second version |
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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