1 files changed, 27 insertions, 0 deletions
diff --git a/system/include/libcxx/ios b/system/include/libcxx/ios
index 25bbfc0b..c10003d0 100644
--- a/system/include/libcxx/ios
+++ b/system/include/libcxx/ios
@@ -983,6 +983,33 @@ defaultfloat(ios_base& __str)
     return __str;
 }
 
+template <class _CharT, class _Traits>
+class __save_flags
+{
+    typedef basic_ios<_CharT, _Traits> __stream_type;
+    typedef typename __stream_type::fmtflags fmtflags;
+
+    __stream_type& __stream_;
+    fmtflags       __fmtflags_;
+    _CharT         __fill_;
+
+    __save_flags(const __save_flags&);
+    __save_flags& operator=(const __save_flags&);
+public:
+    _LIBCPP_INLINE_VISIBILITY
+    explicit __save_flags(__stream_type& __stream)
+        : __stream_(__stream),
+          __fmtflags_(__stream.flags()),
+          __fill_(__stream.fill())
+        {}
+    _LIBCPP_INLINE_VISIBILITY
+    ~__save_flags()
+    {
+        __stream_.flags(__fmtflags_);
+        __stream_.fill(__fill_);
+    }
+};
+
 _LIBCPP_END_NAMESPACE_STD
 
 #endif  // _LIBCPP_IOS