Made directory and file printable with operator <<

dlib/dir_nav/dir_nav_kernel_1.h

@@ -290,6 +290,18 @@ namespace dlib
 
     };
 
+// ----------------------------------------------------------------------------------------
+
+    inline std::ostream& operator<< (
+        std::ostream& out,
+        const directory& item
+    ) { out << (std::string)item; return out; }
+
+    inline std::ostream& operator<< (
+        std::ostream& out,
+        const file& item
+    ) { out << (std::string)item; return out; }
+
 // ----------------------------------------------------------------------------------------
 
     template <

dlib/dir_nav/dir_nav_kernel_2.h

@@ -282,6 +282,18 @@ namespace dlib
 
     };
 
+// ----------------------------------------------------------------------------------------
+
+    inline std::ostream& operator<< (
+        std::ostream& out,
+        const directory& item
+    ) { out << (std::string)item; return out; }
+
+    inline std::ostream& operator<< (
+        std::ostream& out,
+        const file& item
+    ) { out << (std::string)item; return out; }
+
 // ----------------------------------------------------------------------------------------
 
     inline void swap (

dlib/dir_nav/dir_nav_kernel_abstract.h

@@ -457,6 +457,28 @@ namespace dlib
 
     };
 
+// ----------------------------------------------------------------------------------------
+
+    inline std::ostream& operator<< (
+        std::ostream& out,
+        const directory& item
+    );
+    /*!
+        ensures
+            - performs: out << item.full_name()
+            - returns out
+    !*/
+
+    inline std::ostream& operator<< (
+        std::ostream& out,
+        const file& item
+    );
+    /*!
+        ensures
+            - performs: out << item.full_name()
+            - returns out
+    !*/
+
 // ----------------------------------------------------------------------------------------
 
     inline void swap (