Merge #45: [jumbo] Add begin()/end() to Slice.

be4dfc9 [jumbo] Add begin()/end() to Slice. (Peter Kasting)

Pull request description:

  This allows this type to meet the requirements of e.g. std::ranges::range, which is necessary for it to work with the std::span range constructor, or the "non-legacy" constructor for Chromium's base::span.

  Bug: none
  (cherry picked from commit 2cc36eb)

ACKs for top commit:
  l0rinc:
    ACK be4dfc9
  dergoegge:
    Code review ACK be4dfc9

Tree-SHA512: 3f5fad386bc664a84f746226b26eb471e1052e70ef48be8aafd74d0d09381a57ea07074ab3850c96377cff1c180423024383cedcfe11745a93cc685c10fb60dd

Author: fanquake

include/leveldb/slice.h

@@ -52,6 +52,9 @@ class LEVELDB_EXPORT Slice {
   // Return true iff the length of the referenced data is zero
   bool empty() const { return size_ == 0; }
 
+  const char* begin() const { return data(); }
+  const char* end() const { return data() + size(); }
+
   // Return the ith byte in the referenced data.
   // REQUIRES: n < size()
   char operator[](size_t n) const {