View source for cpp/ranges/empty view

===Example===
{{example
|code=
#include <ranges>

int main()
{
    namespace ranges = std::ranges;

    ranges::empty_view<long> e;
    static_assert(ranges::empty(e)); // uses operator bool
    static_assert(0 == e.size());
    static_assert(nullptr == e.data());
    static_assert(nullptr == e.begin());
    static_assert(nullptr == e.end());
    static_assert(nullptr == e.cbegin());
    static_assert(nullptr == e.cend());
}
}}