From c254846ac265cc2e8631b3b9530c59eef9a911ba Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Tue, 26 Nov 2019 07:49:34 +1100
Subject: [PATCH] view: add `equal` overload that takes a parameter

---
 view.hpp | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/view.hpp b/view.hpp
index 102e7c58..a0610264 100644
--- a/view.hpp
+++ b/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 () &&
-               std::equal (std::begin (a), std::end (a), std::begin (b));
+        return ::cruft::equal (a, b, std::equal_to<void> {});
     }