From 11a195fc615c9b0639176077df9947cfc9e5e96c Mon Sep 17 00:00:00 2001
From: ZhuangYumin <zhuangyumin@sjtu.edu.cn>
Date: Sat, 28 Oct 2023 17:30:12 +0800
Subject: [PATCH] fix: error in << and >> with no return stream

---
 src/int2048.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/int2048.cpp b/src/int2048.cpp
index b6a9a1b..759fb5c 100644
--- a/src/int2048.cpp
+++ b/src/int2048.cpp
@@ -359,6 +359,7 @@ std::istream &operator>>(std::istream &stream, int2048 &V) {
   std::string v_str;
   stream >> v_str;
   V.read(v_str);
+  return stream;
 }
 
 std::ostream &operator<<(std::ostream &stream, const int2048 &v) {
@@ -368,6 +369,7 @@ std::ostream &operator<<(std::ostream &stream, const int2048 &v) {
                                 100000, 1000000, 10000000, 100000000};
   for (int i = v.num_length - 1; i >= 0; i--)
     stream << char('0' + v.val[i / v.kNum] / kPow10[i % v.kNum] % 10);
+  return stream;
 }
 
 bool operator==(const int2048 &A, const int2048 &B) {