From ffe697539112bca297d7af73f8a02f9c83a38d58 Mon Sep 17 00:00:00 2001
From: aozhiwei <aozhiwei@kingsome.cn>
Date: Thu, 20 Sep 2018 20:52:41 +0800
Subject: [PATCH] 1

---
 cpp/utils.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cpp/utils.h b/cpp/utils.h
index 75ba6ca..1cba8ef 100644
--- a/cpp/utils.h
+++ b/cpp/utils.h
@@ -31,6 +31,7 @@ template <typename T1,
           typename T2>
 static void RepeatedFieldToVector(const T1& t1, T2& t2)
 {
+    t2.clear();
     for (auto& val : t1) {
         t2.push_back(val);
     }
@@ -40,6 +41,7 @@ template <typename T1,
           typename T2>
 static void RepeatedFieldToSet(const T1& t1, T2& t2)
 {
+    t2.clear();
     for (auto& val : t1) {
         t2.insert(val);
     }
@@ -49,6 +51,7 @@ template <typename T1,
           typename T2>
 static void VectorToRepeatedField(const T1& t1, T2& t2)
 {
+    t2.Clear();
     for (auto& val : t1) {
         *t2.Add() = val;
     }
@@ -58,6 +61,7 @@ template <typename T1,
           typename T2>
 static void SetToRepeatedField(const T1& t1, T2& t2)
 {
+    t2.Clear();
     for (auto& val : t1) {
         *t2.Add() = val;
     }