Added get_distance_type and get_distance_order methods to the C API to

assist in debugging set_distance_type in the Ruby API.

Author: translunar

src/cpp/flann/flann.cpp

@@ -191,6 +191,15 @@ void flann_set_distance_type(flann_distance_t distance_type, int order)
 }
 
 
+flann_distance_t flann_get_distance_type() {
+  return flann_distance_type;
+}
+
+int flann_get_distance_order() {
+  return flann_distance_order;
+}
+
+
 template<typename Distance>
 flann_index_t __flann_build_index(typename Distance::ElementType* dataset, int rows, int cols, float* speedup,
                                   FLANNParameters* flann_params, Distance d = Distance())

src/cpp/flann/flann.h

@@ -100,6 +100,16 @@ FLANN_EXPORT void flann_log_verbosity(int level);
  */
 FLANN_EXPORT void flann_set_distance_type(enum flann_distance_t distance_type, int order);
 
+/**
+ * Gets the distance type in use throughout FLANN.
+ */
+FLANN_EXPORT enum flann_distance_t flann_get_distance_type();
+
+/**
+ * Gets the distance order in use throughout FLANN (only applicable if minkowski distance
+ * is in use).
+ */
+FLANN_EXPORT int flann_get_distance_order();
 
 /**
    Builds and returns an index. It uses autotuning if the target_precision field of index_params