From 23bacf40c83b5545ec211de43dbd73963e4f2bb9 Mon Sep 17 00:00:00 2001
From: Shane Carr <shane@unicode.org>
Date: Thu, 3 May 2018 09:26:15 +0000
Subject: [PATCH] ICU-12572 Fixing undefined behavior in NullableValue
 assignment operator.

X-SVN-Rev: 41318
---
 icu4c/source/i18n/number_types.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/icu4c/source/i18n/number_types.h b/icu4c/source/i18n/number_types.h
index 909302480f..57da72f8aa 100644
--- a/icu4c/source/i18n/number_types.h
+++ b/icu4c/source/i18n/number_types.h
@@ -246,7 +246,13 @@ class U_I18N_API NullableValue {
         fNull = false;
     }
 
-    NullableValue<T>& operator=(const NullableValue<T>& other) = default;
+    NullableValue<T>& operator=(const NullableValue<T>& other) {
+        fNull = other.fNull;
+        if (!fNull) {
+            fValue = other.fValue;
+        }
+        return *this;
+    }
 
     NullableValue<T>& operator=(const T& other) {
         fValue = other;