Allow enqueueing to a pipe from rvalues.

dlib/pipe/pipe_kernel_1.h

@@ -119,6 +119,10 @@ namespace dlib
             T& item
         );
 
+        bool enqueue (
+            T&& item
+        ) { return enqueue(item); }
+
         bool dequeue (
             T& item
         );
@@ -128,6 +132,11 @@ namespace dlib
             unsigned long timeout
         );
 
+        bool enqueue_or_timeout (
+            T&& item,
+            unsigned long timeout
+        ) { return enqueue_or_timeout(item,timeout); }
+
         bool dequeue_or_timeout (
             T& item,
             unsigned long timeout

dlib/pipe/pipe_kernel_abstract.h

@@ -219,6 +219,11 @@ namespace dlib
                     - #item == item (i.e. the value of item is unchanged)
         !*/
 
+        bool enqueue (T&& item) { return enqueue(item); }
+        /*!
+            enable enqueueing from rvalues 
+        !*/
+
         bool enqueue_or_timeout (
             T& item,
             unsigned long timeout
@@ -249,6 +254,11 @@ namespace dlib
                     - #item == item (i.e. the value of item is unchanged)
         !*/
 
+        bool enqueue_or_timeout (T&& item, unsigned long timeout) { return enqueue_or_timeout(item,timeout); }
+        /*!
+            enable enqueueing from rvalues 
+        !*/
+
         bool dequeue (
             T& item
         );