Slightly simplified the dir_nav interface

dlib/dir_nav/dir_nav_kernel_1.h

@@ -219,6 +219,22 @@ namespace dlib
             queue_of_dirs& dirs
         ) const;
 
+        std::vector<file> get_files (
+        ) const
+        {
+            std::vector<file> temp_vector;
+            get_files(temp_vector);
+            return temp_vector;
+        }
+
+        std::vector<directory> get_dirs (
+        ) const
+        {
+            std::vector<directory> temp_vector;
+            get_dirs(temp_vector);
+            return temp_vector;
+        }
+
         const directory get_parent (
         ) const;
        

dlib/dir_nav/dir_nav_kernel_2.h

@@ -212,6 +212,22 @@ namespace dlib
             queue_of_dirs& dirs
         ) const;
 
+        std::vector<file> get_files (
+        ) const
+        {
+            std::vector<file> temp_vector;
+            get_files(temp_vector);
+            return temp_vector;
+        }
+
+        std::vector<directory> get_dirs (
+        ) const
+        {
+            std::vector<directory> temp_vector;
+            get_dirs(temp_vector);
+            return temp_vector;
+        }
+
         const directory get_parent (
         ) const;
        

dlib/dir_nav/dir_nav_kernel_abstract.h

@@ -302,6 +302,13 @@ namespace dlib
                     no effect on *this and #files.size()==0.         
         !*/
 
+        std::vector<file> get_files (
+        ) const;
+        /*!
+            ensures
+                - This function simply calls get_files(temp_vector) and then returns temp_vector.
+        !*/
+
         template <
             typename queue_of_dirs
             >
@@ -330,6 +337,13 @@ namespace dlib
                     no effect on *this and #dirs.size()==0.
         !*/
 
+        std::vector<directory> get_dirs (
+        ) const;
+        /*!
+            ensures
+                - This function simply calls get_dirs(temp_vector) and then returns temp_vector.
+        !*/
+
         bool is_root (
         ) const;
         /*!