move __save_flags from <random> to <ios> in preparation for reuse; no functionality change
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@185968 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/ios b/include/ios
index 25bbfc0..c10003d 100644
--- a/include/ios
+++ b/include/ios
@@ -983,6 +983,33 @@
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