threadedmsg.hh
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1 /* -*- mia-c++ -*-
2  *
3  * This file is part of MIA - a toolbox for medical image analysis
4  * Copyright (c) Leipzig, Madrid 1999-2013 Gert Wollny
5  *
6  * MIA is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with MIA; if not, see <http://www.gnu.org/licenses/>.
18  *
19  */
20 
21 #ifndef mia_core_threadedmsg_hh
22 #define mia_core_threadedmsg_hh
23 
24 #include <ostream>
25 
26 #include <mia/core/defines.hh>
27 
29 
44 class EXPORT_CORE CThreadMsgStream : public std::ostream {
45 public:
51 
57 
63  template <typename OS>
64  static void set_master_stream(OS& master);
65 private:
66  template <typename OS, typename placeholder> friend struct __dispatch_set_master_stream;
67 
68  static void do_set_master_stream(std::ostream& master);
69 
70 
71 
72  std::ostream& m_old;
73 
74 };
75 
90 template <typename OS, typename placeholder>
91 struct __dispatch_set_master_stream {
92  static void apply(OS &master){
93  CThreadMsgStream::do_set_master_stream(master);
94  }
95 
96 };
97 
98 template <typename placeholder>
99 struct __dispatch_set_master_stream<CThreadMsgStream, placeholder> {
100  static void apply(CThreadMsgStream& /*master*/){
101  static_assert(sizeof(placeholder) == 0,
102  "CThreadMsgStream can't be used as master stream because it would deadlock.");
103  }
104 };
105 
107 
108 template <typename OS>
110 {
111  __dispatch_set_master_stream<OS, int>::apply(master);
112 }
113 
114 
115 
117 
118 #endif