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Showing content from https://en.cppreference.com/w/cpp/algorithm/../language/attributes/../../container/span/empty.html below:

std::span<T,Extent>::empty - cppreference.com

constexpr bool empty() const noexcept;

Checks if the span is empty. Equivalent to return size() == 0;.

true if the span is empty; false otherwise.

#include <iomanip>
#include <iostream>
#include <span>
 
int main()
{
    std::span<const char> span{"ABCDEF"};
 
    while (!span.empty())
    {
        std::cout << std::quoted(span.data()) << '\n';
        span = span.last(span.size() - 1);
    }
}

Output:

"ABCDEF"
"BCDEF"
"CDEF"
"DEF"
"EF"
"F"
""

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