From 010b16510f8c00b714d62566505dd2a855b5e344 Mon Sep 17 00:00:00 2001
From: Ivo Ihlemann <38039109+ivoihlemann@users.noreply.github.com>
Date: Thu, 29 Oct 2020 10:02:44 +0100
Subject: [PATCH 1/2] add overload for etl::equal that compares lengths (#294)

* add overload for etl::equal that compares lengths

accoring to std::equal (https://en.cppreference.com/w/cpp/algorithm/equal)

* add test for equal overload that compares lengths
---
 include/etl/algorithm.h | 13 +++++++++++++
 test/test_algorithm.cpp |  4 ++++
 2 files changed, 17 insertions(+)

diff --git a/include/etl/algorithm.h b/include/etl/algorithm.h
index d0d8eaba..b65e9ebb 100644
--- a/include/etl/algorithm.h
+++ b/include/etl/algorithm.h
@@ -800,6 +800,19 @@ namespace etl
   }
 #endif
 
+template <typename TIterator1, typename TIterator2>
+ETL_NODISCARD
+bool equal(TIterator1 first1, TIterator1 last1, TIterator2 first2, TIterator2 last2)
+{
+	if (etl::distance(first1, last1) !=
+		etl::distance(first2, last2))
+	{
+		return false;
+	}
+	return etl::equal(first1, last1, first2);
+}
+
+
 #if ETL_NOT_USING_STL
   //***************************************************************************
   // lexicographical_compare
diff --git a/test/test_algorithm.cpp b/test/test_algorithm.cpp
index aefc9c50..1db1efef 100644
--- a/test/test_algorithm.cpp
+++ b/test/test_algorithm.cpp
@@ -703,6 +703,10 @@ namespace
     {
       CHECK(etl::equal(std::begin(dataV), std::end(dataV), std::begin(dataL)));
       CHECK(!etl::equal(std::begin(dataSL), std::end(dataSL), std::begin(dataL)));
+
+      int small[] = { dataS[0] };
+      CHECK(etl::equal(std::begin(dataV), std::end(dataV), std::begin(dataL), std::end(dataL)));
+      CHECK(!etl::equal(std::begin(dataS), std::end(dataS), std::begin(small), std::end(small)));
     }
 
     //*************************************************************************

From e122e4b18cf745326367f37bda13a1da8fb5b9d1 Mon Sep 17 00:00:00 2001
From: John Wellbelove <github@wellbelove.co.uk>
Date: Thu, 29 Oct 2020 09:29:01 +0000
Subject: [PATCH 2/2] Added STL/No STL options

---
 include/etl/algorithm.h | 39 ++++++++++++++++++++++++++-------------
 1 file changed, 26 insertions(+), 13 deletions(-)

diff --git a/include/etl/algorithm.h b/include/etl/algorithm.h
index b65e9ebb..5debe70e 100644
--- a/include/etl/algorithm.h
+++ b/include/etl/algorithm.h
@@ -789,6 +789,15 @@ namespace etl
 
     return (memcmp(first1, first2, sizeof(value_t) * (last1 - first1)) == 0);
   }
+
+  template <typename TIterator1, typename TIterator2>
+  ETL_NODISCARD
+    bool equal(TIterator1 first1, TIterator1 last1, TIterator2 first2, TIterator2 last2)
+  {
+    return (etl::distance(first1, last1) == etl::distance(first2, last2)) &&
+            etl::equal(first1, last1, first2);
+  }
+
 #else
   //***************************************************************************
   // equal
@@ -798,20 +807,24 @@ namespace etl
   {
     return std::equal(first1, last1, first2);
   }
+
+#if ETL_CPP14_SUPPORTED
+  template <typename TIterator1, typename TIterator2>
+  ETL_NODISCARD
+    bool equal(TIterator1 first1, TIterator1 last1, TIterator2 first2, TIterator2 last2)
+  {
+    return std::equal(first1, last1, first2, last2);
+  }
+#else
+  template <typename TIterator1, typename TIterator2>
+  ETL_NODISCARD
+  bool equal(TIterator1 first1, TIterator1 last1, TIterator2 first2, TIterator2 last2)
+  {
+    return (etl::distance(first1, last1) == etl::distance(first2, last2)) &&
+            etl::equal(first1, last1, first2);
+  }
+#endif
 #endif
-
-template <typename TIterator1, typename TIterator2>
-ETL_NODISCARD
-bool equal(TIterator1 first1, TIterator1 last1, TIterator2 first2, TIterator2 last2)
-{
-	if (etl::distance(first1, last1) !=
-		etl::distance(first2, last2))
-	{
-		return false;
-	}
-	return etl::equal(first1, last1, first2);
-}
-
 
 #if ETL_NOT_USING_STL
   //***************************************************************************