Revert the change which control the pointer

Author: martinfantini

src/mfast/aggregate_ref.h

@@ -57,7 +57,6 @@ class aggregate_cref {
     this->instruction_ = other.instruction_;
     this->storage_array_ = other.storage_array_;
   }
-  bool content() const { return storage_array_->of_group.content_ != nullptr; }
 
   class iterator
       : public boost::iterator_facade<iterator, field_cref,

src/mfast/ext_ref.h

@@ -194,7 +194,7 @@ class ext_cref<BaseCRef, group_type_tag, Properties>
   explicit ext_cref(const field_cref &base) : base_(base) {}
   explicit ext_cref(const aggregate_cref &base) : base_(base) {}
   cref_type get() const { return base_; }
-  bool present() const { return !this->optional() || base_.content(); }
+  bool present() const { return !this->optional() || base_.present(); }
 
 private:
   cref_type base_;