1 files changed, 18 insertions, 0 deletions
diff --git a/examples/snavely_reprojection_error.h b/examples/snavely_reprojection_error.h
index 0704217..d3263f3 100644
--- a/examples/snavely_reprojection_error.h
+++ b/examples/snavely_reprojection_error.h
@@ -91,6 +91,14 @@ struct SnavelyReprojectionError {
     return true;
   }
 
+  // Factory to hide the construction of the CostFunction object from
+  // the client code.
+  static ceres::CostFunction* Create(const double observed_x,
+                                     const double observed_y) {
+    return (new ceres::AutoDiffCostFunction<SnavelyReprojectionError, 2, 9, 3>(
+                new SnavelyReprojectionError(observed_x, observed_y)));
+  }
+
   double observed_x;
   double observed_y;
 };
@@ -146,6 +154,16 @@ struct SnavelyReprojectionErrorWithQuaternions {
     return true;
   }
 
+  // Factory to hide the construction of the CostFunction object from
+  // the client code.
+  static ceres::CostFunction* Create(const double observed_x,
+                                     const double observed_y) {
+    return (new ceres::AutoDiffCostFunction<
+            SnavelyReprojectionErrorWithQuaternions, 2, 4, 6, 3>(
+                new SnavelyReprojectionErrorWithQuaternions(observed_x,
+                                                            observed_y)));
+  }
+
   double observed_x;
   double observed_y;
 };