Added is_array template.

dlib/array/array_kernel.h

@@ -8,6 +8,7 @@
 #include "../algs.h"
 #include "../serialize.h"
 #include "../sort.h"
+#include "../is_kind.h"
 
 namespace dlib
 {
@@ -742,6 +743,14 @@ namespace dlib
         }
     }
 
+// ----------------------------------------------------------------------------------------
+
+    template <typename T, typename MM>
+    struct is_array <array<T,MM> >  
+    {
+        const static bool value = true;
+    };
+
 // ----------------------------------------------------------------------------------------
 
 }

dlib/is_kind.h

@@ -72,6 +72,19 @@ namespace dlib
         !*/
     };
 
+// ----------------------------------------------------------------------------------------
+
+    template <typename T>
+    struct is_array : public default_is_kind_value  
+    {
+        /*!
+            - if (T is an implementation of array/array_kernel_abstract.h) then
+                - is_array<T>::value == true
+            - else
+                - is_array<T>::value == false
+        !*/
+    };
+
 // ----------------------------------------------------------------------------------------
 
     template <typename T>

dlib/test/array.cpp

@@ -35,6 +35,7 @@ namespace
     {        
         dlib::rand rnd;
 
+        DLIB_TEST(is_array<array>::value == true);
 
         array a1, a2;
 
@@ -606,6 +607,8 @@ namespace
         a.push_back(temp);
         DLIB_TEST(a.size() == 6);
         DLIB_TEST(a[5].whatever == 99);
+
+        DLIB_TEST(is_array<array<stuff> >::value == true);
     }
 
 
@@ -627,6 +630,8 @@ namespace
             // test a checking version first for good measure
             print_spinner();
             array_expand_test<array<unsigned long> >();
+
+            DLIB_TEST(is_array<int>::value == false);
         }
     } a;