view: add equal overload that takes a parameter

view.hpp

@@ -792,6 +792,25 @@ namespace cruft {
 
 
     ///////////////////////////////////////////////////////////////////////////
+    template <
+        typename BeginA, typename EndA,
+        typename BeginB, typename EndB,
+        typename ComparatorT
+    >
+    decltype(auto)
+    equal (
+        view<BeginA,EndA> const &a,
+        view<BeginB,EndB> const &b,
+        ComparatorT &&cmp
+    ) {
+        return std::equal (
+            std::begin (a), std::end (a),
+            std::begin (b), std::end (b),
+            std::forward<ComparatorT> (cmp)
+        );
+    }
+
+    //-------------------------------------------------------------------------
     template <
         typename BeginA, typename EndA,
         typename BeginB, typename EndB
@@ -799,8 +818,7 @@ namespace cruft {
     constexpr bool
     equal (const view<BeginA,EndA> &a, const view<BeginB,EndB> &b)
     {
-        return a.size () == b.size () &&
+        return ::cruft::equal (a, b, std::equal_to<void> {});
-               std::equal (std::begin (a), std::end (a), std::begin (b));
     }