整理

include/boost/io/detail/ostream_guard.hpp

@@ -0,0 +1,45 @@
+/*
+Copyright 2019-2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#ifndef BOOST_IO_DETAIL_OSTREAM_GUARD_HPP
+#define BOOST_IO_DETAIL_OSTREAM_GUARD_HPP
+
+#include <boost/config.hpp>
+#include <iosfwd>
+
+namespace boost {
+namespace io {
+namespace detail {
+
+template<class Char, class Traits>
+class ostream_guard {
+public:
+    explicit ostream_guard(std::basic_ostream<Char, Traits>& os) BOOST_NOEXCEPT
+        : os_(&os) { }
+
+    ~ostream_guard() BOOST_NOEXCEPT_IF(false) {
+        if (os_) {
+            os_->setstate(std::basic_ostream<Char, Traits>::badbit);
+        }
+    }
+
+    void release() BOOST_NOEXCEPT {
+        os_ = 0;
+    }
+
+private:
+    ostream_guard(const ostream_guard&);
+    ostream_guard& operator=(const ostream_guard&);
+
+    std::basic_ostream<Char, Traits>* os_;
+};
+
+} /* detail */
+} /* io */
+} /* boost */
+
+#endif