Added optional object based API for C++.

Change-Id: If927f3ea3fb3723088fa287f24bdd1ad43c8d1d1
Tested: on Linux.

include/flatbuffers/flatbuffers.h

@@ -984,6 +984,17 @@ FLATBUFFERS_FINAL_CLASS
     return CreateVector(v.data(), v.size());
   }
 
+  // vector<bool> may be implemented using a bit-set, so we can't access it as
+  // an array. Instead, read elements manually.
+  // Background: https://isocpp.org/blog/2012/11/on-vectorbool
+  Offset<Vector<uint8_t>> CreateVector(const std::vector<bool> &v) {
+    StartVector(v.size(), sizeof(uint8_t));
+    for (auto i = v.size(); i > 0; ) {
+      PushElement(static_cast<uint8_t>(v[--i]));
+    }
+    return Offset<Vector<uint8_t>>(EndVector(v.size()));
+  }
+
   /// @brief Serialize values returned by a function into a FlatBuffer `vector`.
   /// This is a convenience function that takes care of iteration for you.
   /// @tparam T The data type of the `std::vector` elements.
@@ -1523,6 +1534,12 @@ class Table {
   uint8_t data_[1];
 };
 
+// Base class for native objects (FlatBuffer data de-serialized into native
+// C++ data structures).
+// Contains no functionality, purely documentative.
+struct NativeTable {
+};
+
 // Helper function to test if a field is present, using any of the field
 // enums in the generated code.
 // `table` must be a generated table type. Since this is a template parameter,

include/flatbuffers/idl.h

@@ -338,7 +338,8 @@ struct IDLOptions {
   bool skip_unexpected_fields_in_json;
   bool generate_name_strings;
   bool escape_proto_identifiers;
-  
+  bool generate_object_based_api;
+
   // Possible options for the more general generator below.
   enum Language { kJava, kCSharp, kGo, kMAX };
 
@@ -358,6 +359,7 @@ struct IDLOptions {
       skip_unexpected_fields_in_json(false),
       generate_name_strings(false),
       escape_proto_identifiers(false),
+      generate_object_based_api(false),
       lang(IDLOptions::kJava) {}
 };