ios_guard.hh

#ifndef VTESTBED_BASE_IOS_GUARD_HH
#define VTESTBED_BASE_IOS_GUARD_HH

#include <ios>

namespace vtb {

    namespace base {

        class ios_guard {

        private:
            std::ios& _ios;
            std::ios::iostate _oldstate;

        public:

            inline explicit
            ios_guard(std::ios& ios): _ios(ios) { this->save(); }
            ~ios_guard() noexcept { this->restore(); }

            inline void
            save() noexcept {
                this->_oldstate = this->_ios.exceptions();
            }

            inline void
            restore() noexcept {
                try { this->_ios.exceptions(this->_oldstate); } catch (...) { }
            }

            ios_guard(const ios_guard&) = delete;
            ios_guard& operator=(const ios_guard&) = delete;
            ios_guard(ios_guard&&) = delete;
            ios_guard& operator=(ios_guard&&) = delete;

        };

    }

}

#endif // vim:filetype=cpp