Minor changes to avoid compiler warnings.

dlib/image_processing/scan_fhog_pyramid.h

@@ -52,7 +52,7 @@ namespace dlib
             extract_fhog_features(img,hog,cell_size,filter_rows_padding,filter_cols_padding);
         }
 
-        inline long get_num_planes (
+        inline unsigned long get_num_planes (
         ) const
         {
             return 31;

dlib/image_processing/scan_fhog_pyramid_abstract.h

@@ -173,7 +173,7 @@ namespace dlib
                             feats_to_image(point(c,r),cell_size,filter_rows_padding,filter_cols_padding)
         !*/
 
-        inline long get_num_planes (
+        inline unsigned long get_num_planes (
         ) const { return 31; }
         /*!
             ensures

dlib/svm/cross_validate_track_association_trainer.h

@@ -31,7 +31,7 @@ namespace dlib
 
             dlib::rand rnd;
             std::vector<track_type> tracks;
-            std::map<label_type,unsigned long> track_idx; // tracks[track_idx[id]] == track with ID id.
+            std::map<label_type,long> track_idx; // tracks[track_idx[id]] == track with ID id.
 
             for (unsigned long j = 0; j < samples.size(); ++j)
             {

dlib/test/learning_to_track.cpp

@@ -113,7 +113,7 @@ namespace
     }
 
     template <typename detection>
-    detection sample_detection_from_sensor(unsigned long object_id)
+    detection sample_detection_from_sensor(long object_id)
     {
         DLIB_CASSERT(object_id < num_objects, 
             "You can't ask to sample a detection from an object that doesn't exist."); 
@@ -179,7 +179,7 @@ namespace
 // ----------------------------------------------------------------------------------------
 
     template <typename detection>
-    std::vector<detection> make_random_detections(unsigned long num_dets)
+    std::vector<detection> make_random_detections(long num_dets)
     {
         DLIB_CASSERT(num_dets <= num_objects, 
             "You can't ask for more detections than there are objects in our little simulation.");