Added an overload of net_to_xml() that takes a string filename.

dlib/dnn/utilities.h

@@ -6,6 +6,7 @@
 #include "core.h"
 #include "utilities_abstract.h"
 #include "../geometry.h"
+#include <fstream>
 
 namespace dlib
 {
@@ -111,6 +112,16 @@ namespace dlib
         out.precision(old_precision);
     }
 
+    template <typename net_type>
+    void net_to_xml (
+        const net_type& net,
+        const std::string& filename
+    )
+    {
+        std::ofstream fout(filename);
+        net_to_xml(net, fout);
+    }
+
 // ----------------------------------------------------------------------------------------
 
     namespace impl

dlib/dnn/utilities_abstract.h

@@ -56,6 +56,21 @@ namespace dlib
               stream.
     !*/
 
+    template <typename net_type>
+    void net_to_xml (
+        const net_type& net,
+        const std::string& filename
+    );
+    /*!
+        requires
+            - net_type is an object of type add_layer, add_loss_layer, add_skip_layer, or
+              add_tag_layer.
+            - All layers in the net must provide to_xml() functions.
+        ensures
+            - This function is just like the above net_to_xml(), except it writes to a file
+              rather than an ostream.
+    !*/
+
 // ----------------------------------------------------------------------------------------
 
     template <typename net_type>