From 6cccdc24bcb8605965c1e2497c61504cd388bde9 Mon Sep 17 00:00:00 2001
From: Victor Zverovich <viz@fb.com>
Date: Tue, 1 Sep 2020 08:16:53 -0700
Subject: [PATCH] Fix move constructor (#1844)

---
 include/fmt/os.h | 4 +++-
 test/os-test.cc  | 6 ++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/fmt/os.h b/include/fmt/os.h
index caf6a4b2..66e66678 100644
--- a/include/fmt/os.h
+++ b/include/fmt/os.h
@@ -396,7 +396,9 @@ class ostream : private detail::buffer<char> {
   }
 
  public:
-  ostream(ostream&& other) : file_(std::move(other.file_)) {
+  ostream(ostream&& other)
+      : detail::buffer<char>(other.data(), other.size(), other.capacity()),
+        file_(std::move(other.file_)) {
     other.set(nullptr, 0);
   }
   ~ostream() {
diff --git a/test/os-test.cc b/test/os-test.cc
index 4a54c063..359b5ff8 100644
--- a/test/os-test.cc
+++ b/test/os-test.cc
@@ -287,6 +287,12 @@ TEST(BufferedFileTest, Fileno) {
   EXPECT_READ(copy, FILE_CONTENT);
 }
 
+TEST(OStreamTest, Move) {
+  fmt::ostream out = fmt::output_file("test-file");
+  fmt::ostream moved(std::move(out));
+  moved.print("hello");
+}
+
 TEST(OStreamTest, Print) {
   fmt::ostream out = fmt::output_file("test-file");
   out.print("The answer is {}.\n", 42);