threadedmsg.hh

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/* -*- mia-c++  -*-
 *
 * This file is part of MIA - a toolbox for medical image analysis 
 * Copyright (c) Leipzig, Madrid 1999-2017 Gert Wollny
 *
 * MIA is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with MIA; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef mia_core_threadedmsg_hh
#define mia_core_threadedmsg_hh

#include <ostream>

#include <mia/core/defines.hh>

NS_MIA_BEGIN

class EXPORT_CORE CThreadMsgStream : public std::ostream {
public: 
        CThreadMsgStream();

        ~CThreadMsgStream();

        template <typename OS>
        static void set_master_stream(OS& master); 
private: 
        template <typename OS, typename placeholder> friend struct __dispatch_set_master_stream; 
        
        static void do_set_master_stream(std::ostream& master); 
        
        
        std::ostream& m_old; 

}; 

template <typename OS, typename placeholder>
struct __dispatch_set_master_stream {
        static void apply(OS &master){
                CThreadMsgStream::do_set_master_stream(master); 
        }
        
}; 

template <typename placeholder>
struct __dispatch_set_master_stream<CThreadMsgStream, placeholder> {
        static void apply(CThreadMsgStream& /*master*/){
                static_assert(sizeof(placeholder) == 0, 
                              "CThreadMsgStream can't be used as master stream because it would deadlock."); 
        }
}; 


template <typename OS>
void CThreadMsgStream::set_master_stream(OS& master)
{
        __dispatch_set_master_stream<OS, int>::apply(master); 
}



NS_MIA_END

#endif