[C++] Delete StringPiecePod (#8353)

Protobuf no longer supports C++ < 11, so this type is no longer
required.

src/google/protobuf/stubs/stringpiece.h

@@ -426,49 +426,6 @@ inline bool operator>=(StringPiece x, StringPiece y) {
 // allow StringPiece to be logged
 extern std::ostream& operator<<(std::ostream& o, StringPiece piece);
 
-namespace internal {
-// StringPiece is not a POD and can not be used in an union (pre C++11). We
-// need a POD version of it.
-struct StringPiecePod {
-  // Create from a StringPiece.
-  static StringPiecePod CreateFromStringPiece(StringPiece str) {
-    StringPiecePod pod;
-    pod.data_ = str.data();
-    pod.size_ = str.size();
-    return pod;
-  }
-
-  // Cast to StringPiece.
-  operator StringPiece() const { return StringPiece(data_, size_); }
-
-  bool operator==(const char* value) const {
-    return StringPiece(data_, size_) == StringPiece(value);
-  }
-
-  char operator[](stringpiece_ssize_type i) const {
-    assert(0 <= i);
-    assert(i < size_);
-    return data_[i];
-  }
-
-  const char* data() const { return data_; }
-
-  stringpiece_ssize_type size() const {
-    return size_;
-  }
-
-  std::string ToString() const {
-    return std::string(data_, static_cast<size_t>(size_));
-  }
-
-  explicit operator std::string() const { return ToString(); }
-
- private:
-  const char* data_;
-  stringpiece_ssize_type size_;
-};
-
-}  // namespace internal
 }  // namespace protobuf
 }  // namespace google
 

src/google/protobuf/stubs/strutil.h

@@ -664,9 +664,6 @@ struct PROTOBUF_EXPORT AlphaNum {
   AlphaNum(StringPiece str)
       : piece_data_(str.data()), piece_size_(str.size()) {}
 
-  AlphaNum(internal::StringPiecePod str)
-      : piece_data_(str.data()), piece_size_(str.size()) {}
-
   size_t size() const { return piece_size_; }
   const char *data() const { return piece_data_; }
 

src/google/protobuf/util/internal/datapiece.h

@@ -93,12 +93,12 @@ class PROTOBUF_EXPORT DataPiece {
       : type_(TYPE_BOOL), bool_(value), use_strict_base64_decoding_(false) {}
   DataPiece(StringPiece value, bool use_strict_base64_decoding)
       : type_(TYPE_STRING),
-        str_(StringPiecePod::CreateFromStringPiece(value)),
+        str_(value),
         use_strict_base64_decoding_(use_strict_base64_decoding) {}
   // Constructor for bytes. The second parameter is not used.
   DataPiece(StringPiece value, bool dummy, bool use_strict_base64_decoding)
       : type_(TYPE_BYTES),
-        str_(StringPiecePod::CreateFromStringPiece(value)),
+        str_(value),
         use_strict_base64_decoding_(use_strict_base64_decoding) {}
 
   DataPiece(const DataPiece& r) : type_(r.type_) { InternalCopy(r); }
@@ -191,8 +191,6 @@ class PROTOBUF_EXPORT DataPiece {
   // Data type for this piece of data.
   Type type_;
 
-  typedef ::google::protobuf::internal::StringPiecePod StringPiecePod;
-
   // Stored piece of data.
   union {
     int32 i32_;
@@ -202,7 +200,7 @@ class PROTOBUF_EXPORT DataPiece {
     double double_;
     float float_;
     bool bool_;
-    StringPiecePod str_;
+    StringPiece str_;
   };
 
   // Uses a stricter version of base64 decoding for byte fields.