Made dlib::array able to push_back() from rvalues.

dlib/array/array_kernel.h

@@ -193,6 +193,10 @@ namespace dlib
             T& item
         );
 
+        void push_back (
+            T&& item
+        );
+
         typedef T* iterator;
         typedef const T* const_iterator;
         iterator                begin()                         { return array_elements; }
@@ -779,6 +783,17 @@ namespace dlib
         }
     }
 
+// ----------------------------------------------------------------------------------------
+
+    template <
+        typename T,
+        typename mem_manager
+        >
+    void array<T,mem_manager>::
+    push_back (
+        T&& item
+    ) { push_back(item); }
+
 // ----------------------------------------------------------------------------------------
 
     template <typename T, typename MM>

dlib/array/array_kernel_abstract.h

@@ -274,6 +274,11 @@ namespace dlib
                        If an exception is thrown then it has no effect on *this.
             !*/
 
+            void push_back (T&& item) { push_back(item); }
+            /*!
+                enable push_back from rvalues 
+            !*/
+
             typedef T* iterator;
             typedef const T* const_iterator;