26 class SkSpan {
28     constexpr SkSpan() : fPtr{nullptr}, fSize{0} {}  in SkSpan()  function
29     constexpr SkSpan(T* ptr, size_t size) : fPtr{ptr}, fSize{size} {}  in SkSpan()  function
31     constexpr SkSpan(const SkSpan<U>& that) : fPtr(that.data()), fSize{that.size()} {}  in SkSpan()  function
32     constexpr SkSpan(const SkSpan& o) = default;
34     constexpr SkSpan& operator=(const SkSpan& that) {
53     constexpr SkSpan<T> first(size_t prefixLen) const {  in first()
55         return SkSpan{fPtr, prefixLen};  in first()
57     constexpr SkSpan<T> last(size_t postfixLen) const {  in last()
59         return SkSpan{fPtr + (this->size() - postfixLen), postfixLen};  in last()
61     constexpr SkSpan<T> subspan(size_t offset, size_t count) const {  in subspan()
64         return SkSpan{fPtr + offset, count};  in subspan()
72 template <typename T, typename S> inline constexpr SkSpan<T> SkMakeSpan(T* p, S s) {  in SkMakeSpan()
73     return SkSpan<T>{p, SkTo<size_t>(s)};  in SkMakeSpan()
76 template <size_t N, typename T> inline constexpr SkSpan<T> SkMakeSpan(T (&a)[N]) {  in SkMakeSpan()
77     return SkSpan<T>{a, N};  in SkMakeSpan()
82         -> SkSpan<typename std::remove_reference<decltype(*(c.data()))>::type> {