1 files changed, 19 insertions, 0 deletions
diff --git a/src/google/protobuf/extension_set_heavy.cc b/src/google/protobuf/extension_set_heavy.cc
index 27f2bc8b..2721f15d 100644
--- a/src/google/protobuf/extension_set_heavy.cc
+++ b/src/google/protobuf/extension_set_heavy.cc
@@ -46,6 +46,25 @@ namespace google {
 namespace protobuf {
 namespace internal {
 
+// Implementation of ExtensionFinder which finds extensions in a given
+// DescriptorPool, using the given MessageFactory to construct sub-objects.
+// This class is implemented in extension_set_heavy.cc.
+class DescriptorPoolExtensionFinder : public ExtensionFinder {
+ public:
+  DescriptorPoolExtensionFinder(const DescriptorPool* pool,
+                                MessageFactory* factory,
+                                const Descriptor* containing_type)
+      : pool_(pool), factory_(factory), containing_type_(containing_type) {}
+  virtual ~DescriptorPoolExtensionFinder() {}
+
+  virtual bool Find(int number, ExtensionInfo* output);
+
+ private:
+  const DescriptorPool* pool_;
+  MessageFactory* factory_;
+  const Descriptor* containing_type_;
+};
+
 void ExtensionSet::AppendToList(const Descriptor* containing_type,
                                 const DescriptorPool* pool,
                                 vector<const FieldDescriptor*>* output) const {