是否有随机访问迭代器的 std 视图，因为 std::span 用于连续迭代器？

Question

Is there a standard view for random access iterators, as std::span is for contiguous iterators?

It is a piece of cake to implement such thing, but I ask before reinvent the wheel. I don't see something like that on cppreference.

Answer 1

std::span is a pointer and a size (or equivalently two pointers). It doesn't need to do type erasure.

A random_access_view would have the overhead of type erasure, so I don't expect one to be standardised.

Instead I would suggest a template constrained to std::ranges::random_access_range , possibly in conjunction with std::ranges::viewable_range if you need a view specifically.