The view for any range.

span lite: single-file header-only version of a C++20-like span for C++98, C++11 and later

by Martin Moene

From the article:

span lite is a single-file header-only library to provide a bounds-safe view for sequences of objects. The library provides a C++20-like span for use with C++98 and later. If available, std::span is used, unless configured otherwise...