lst-0044-book.cpp
// https://godbolt.org/z/a3qqr1YPM
int car[5] {1,2,3,4,5};
span span_1 = car; // directly from a C-array
array arr {1,2,3,4,5};
span span_2 {arr}; // directly from a std::array
vector vec {1,2,3,4,5};
span<int,3> span_3 {vec}; // with 'Extent' from a std::vector