31 class Span;  variable
41   friend bool operator==(Span<T> lhs, Span<T> rhs) {
58   friend bool operator!=(Span<T> lhs, Span<T> rhs) { return !(lhs == rhs); }
94 class Span : private internal::SpanBase<const T> {
111   constexpr Span() : Span(nullptr, 0) {}  in Span()  function
112   constexpr Span(T *ptr, size_t len) : data_(ptr), size_(len) {}  in Span()  function
115   constexpr Span(T (&array)[N]) : Span(array, N) {}  in Span()  function
120   Span(const C &container) : data_(container.data()), size_(container.size()) {}  in Span()  function
125   explicit Span(C &container)  in Span()  function
158   Span subspan(size_t pos = 0, size_t len = npos) const {
162     return Span(data_ + pos, std::min(size_ - pos, len));
171 const size_t Span<T>::npos;
174 Span<T> MakeSpan(T *ptr, size_t size) {  in MakeSpan()
175   return Span<T>(ptr, size);  in MakeSpan()
184 Span<const T> MakeConstSpan(T *ptr, size_t size) {  in MakeConstSpan()
185   return Span<const T>(ptr, size);  in MakeConstSpan()