/home/mhx/git/github/libmoost/include/moost/logging/pseudo_ostream.hpp

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/* vim:set ts=3 sw=3 sts=3 et: */
#ifndef MOOST_LOGGING_PSEUDO_OSTREAM_HPP__
#define MOOST_LOGGING_PSEUDO_OSTREAM_HPP__

#include <boost/thread.hpp>

namespace moost { namespace logging {

class pseudo_ostream
{
   public:
      pseudo_ostream() : pout_(0) {}

      void attach(std::ostream & out)
      {
         boost::lock_guard<boost::mutex> lock(mtx_);
         pout_ = &out;
      }

      void detach()
      {
         pout_ = 0;
      }

      template <typename T>
      pseudo_ostream & operator << (T const & t)
      {
         boost::lock_guard<boost::mutex> lock(mtx_);
         if(pout_)
         {
            *pout_ << t;
         }

         return *this;
      }

      typedef std::ostream & (*iomanip_t)(std::ostream &);
      pseudo_ostream & operator << (iomanip_t const & iomanip)
      {
         boost::lock_guard<boost::mutex> lock(mtx_);
         if(pout_)
         {
            iomanip(*pout_);
         }

         return *this;
      }

      operator void *() const
      {
         boost::lock_guard<boost::mutex> lock(mtx_);
         return pout_ ? *pout_ : static_cast<void *>(0);
      }

   private:
      std::ostream * pout_;
      mutable boost::mutex mtx_;

};

}}

#endif