## Class sentry

boost::log::basic_formatting_ostream::sentry

## Synopsis

    // In header: <boost/log/utility/formatting_ostream.hpp>

    class sentry : public sentry {
    public:
      // construct/copy/destruct
      explicit sentry(basic_formatting_ostream &);
      sentry(sentry const &) = delete;
      sentry& operator=(sentry const &) = delete;
    };

## Description

### `sentry` public construct/copy/destruct

1.     explicit sentry(basic_formatting_ostream & strm);

2.     sentry(sentry const &) = delete;

3.     sentry& operator=(sentry const &) = delete;