io/detail/ostream_guard.hpp

0001 /*
0002 Copyright 2019-2020 Glen Joseph Fernandes
0003 (glenjofe@gmail.com)
0004
0005 Distributed under the Boost Software License, Version 1.0.
0006 (http://www.boost.org/LICENSE_1_0.txt)
0007 */
0008 #ifndef BOOST_IO_DETAIL_OSTREAM_GUARD_HPP
0009 #define BOOST_IO_DETAIL_OSTREAM_GUARD_HPP
0010
0011 #include <boost/config.hpp>
0012 #include <iosfwd>
0013
0014 namespace boost {
0015 namespace io {
0016 namespace detail {
0017
0018 template<class Char, class Traits>
0019 class ostream_guard {
0020 public:
0021     explicit ostream_guard(std::basic_ostream<Char, Traits>& os) BOOST_NOEXCEPT
0022         : os_(&os) { }
0023
0024     ~ostream_guard() BOOST_NOEXCEPT_IF(false) {
0025         if (os_) {
0026             os_->setstate(std::basic_ostream<Char, Traits>::badbit);
0027         }
0028     }
0029
0030     void release() BOOST_NOEXCEPT {
0031         os_ = 0;
0032     }
0033
0034 private:
0035     ostream_guard(const ostream_guard&);
0036     ostream_guard& operator=(const ostream_guard&);
0037
0038     std::basic_ostream<Char, Traits>* os_;
0039 };
0040
0041 } /* detail */
0042 } /* io */
0043 } /* boost */
0044
0045 #endif