From c734e03dd0bc4736855e660f4330780329413057 Mon Sep 17 00:00:00 2001
From: jules <jules@juce.com>
Date: Wed, 21 Mar 2018 10:49:27 +0000
Subject: [PATCH] Avoided some UB warnings when trying to sort empty arrays

---
 .../juce_core/containers/juce_ElementComparator.h | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/modules/juce_core/containers/juce_ElementComparator.h b/modules/juce_core/containers/juce_ElementComparator.h
index 6e0f24c2e3..8ce16acd56 100644
--- a/modules/juce_core/containers/juce_ElementComparator.h
+++ b/modules/juce_core/containers/juce_ElementComparator.h
@@ -82,12 +82,17 @@ static void sortArray (ElementComparator& comparator,
                        int lastElement,
                        const bool retainOrderOfEquivalentItems)
 {
-    SortFunctionConverter<ElementComparator> converter (comparator);
+    jassert (firstElement >= 0);
 
-    if (retainOrderOfEquivalentItems)
-        std::stable_sort (array + firstElement, array + lastElement + 1, converter);
-    else
-        std::sort        (array + firstElement, array + lastElement + 1, converter);
+    if (lastElement > firstElement)
+    {
+        SortFunctionConverter<ElementComparator> converter (comparator);
+
+        if (retainOrderOfEquivalentItems)
+            std::stable_sort (array + firstElement, array + lastElement + 1, converter);
+        else
+            std::sort        (array + firstElement, array + lastElement + 1, converter);
+    }
 }