src/io/basic_teebuf.hpp

/*
 * Copyright (c) 2005 The University of Notre Dame. All Rights Reserved.
 *
 * The University of Notre Dame grants you ("Licensee") a
 * non-exclusive, royalty free, license to use, modify and
 * redistribute this software in source and binary code form, provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the
 *    distribution.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. All express or implied conditions, representations and
 * warranties, including any implied warranty of merchantability,
 * fitness for a particular purpose or non-infringement, are hereby
 * excluded.  The University of Notre Dame and its licensors shall not
 * be liable for any damages suffered by licensee as a result of
 * using, modifying or distributing the software or its
 * derivatives. In no event will the University of Notre Dame or its
 * licensors be liable for any lost revenue, profit or data, or for
 * direct, indirect, special, consequential, incidental or punitive
 * damages, however caused and regardless of the theory of liability,
 * arising out of the use of or inability to use software, even if the
 * University of Notre Dame has been advised of the possibility of
 * such damages.
 *
 * SUPPORT OPEN SCIENCE!  If you use OpenMD or its source code in your
 * research, please cite the appropriate papers when you publish your
 * work.  Good starting points are:
 *                                                                      
 * [1]  Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).             
 * [2]  Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).          
 * [3]  Sun, Lin & Gezelter, J. Chem. Phys. 128, 24107 (2008).          
 * [4]  Kuang & Gezelter,  J. Chem. Phys. 133, 164101 (2010).
 * [5]  Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
 */

#ifndef UTILS_MULTISTREAMBUF_HPP
#define UTILS_MULTISTREAMBUF_HPP
#include <streambuf>
#include <vector>
namespace OpenMD {

  /**
   * @class basic_teebuf basic_teebuf.hpp "utils/basic_teebuf.hpp"
   * @brief As a subclass of basic_streambuf,  basic_teebuf can operate on multiple stream simultaneously.
   * @code
   *    std::ofstream file1("file1");
   *    std::ofstream file2("file22");
   *    std::vector<std::streambuf*> buffers;
   *    buffers.push_back(file1.rdbuf());
   *    buffers.push_back(file2.rdbuf());
   *    teebuf tmp(buffers.begin(), buffers.end());
   *    std::ostream myOs(&tmp);
   *    myOs << "hello world";
   * @endcode
   */

  template <class CharT, class Traits = std::char_traits<CharT> > 
  class basic_teebuf: public std::basic_streambuf<CharT, Traits> { 
  public: 
    typedef std::basic_streambuf<CharT, Traits> streambuf_type; 
    typedef Traits traits_type; 
    typedef CharT char_type; 
    typedef typename traits_type::int_type int_type; 

    template <typename ForwardIterator>
    basic_teebuf(ForwardIterator begin, ForwardIterator end) : buffers_(begin, end){

    }

  protected:
    int_type overflow(int_type c = traits_type::eof()) {

      //avoid writing eof to stream
      if (c == traits_type::eof()) {
        return traits_type::eof();
      }
            
      typename std::vector<streambuf_type*>::iterator iter; //typename is needed since it's a dependant name
      for (iter = buffers_.begin(); iter != buffers_.end(); ++iter) {
        if ((*iter)->sputc(c) ==  traits_type::eof()) {
          return  traits_type::eof();
        }
      }

      return traits_type::not_eof(c); 
    }

    int sync() { 

      //flush buffer, checking return for eof. 
      if (traits_type::eq_int_type(overflow(traits_type::eof()), traits_type::eof())) { 
        return -1; 
      } 

      //flush streams
      typename std::vector<streambuf_type*>::iterator iter;
      for (iter = buffers_.begin(); iter != buffers_.end(); ++iter) {
        if ((*iter)->pubsync() == -1) {
          return -1;
        }
      }
            
      return 0; 
    } 
   
  private:
    std::vector<streambuf_type*> buffers_;
  };

  typedef basic_teebuf<char> TeeBuf; 

}
#endif
Revision:	1782
Committed:	Wed Aug 22 02:28:28 2012 UTC (13 years, 2 months ago) by gezelter
File size:	4352 byte(s)
Log Message:	MERGE OpenMD development branch 1465:1781 into trunk
#	Content
1	/*
2	* Copyright (c) 2005 The University of Notre Dame. All Rights Reserved.
3	*
4	* The University of Notre Dame grants you ("Licensee") a
5	* non-exclusive, royalty free, license to use, modify and
6	* redistribute this software in source and binary code form, provided
7	* that the following conditions are met:
8	*
9	* 1. Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.
11	*
12	* 2. Redistributions in binary form must reproduce the above copyright
13	* notice, this list of conditions and the following disclaimer in the
14	* documentation and/or other materials provided with the
15	* distribution.
16	*
17	* This software is provided "AS IS," without a warranty of any
18	* kind. All express or implied conditions, representations and
19	* warranties, including any implied warranty of merchantability,
20	* fitness for a particular purpose or non-infringement, are hereby
21	* excluded. The University of Notre Dame and its licensors shall not
22	* be liable for any damages suffered by licensee as a result of
23	* using, modifying or distributing the software or its
24	* derivatives. In no event will the University of Notre Dame or its
25	* licensors be liable for any lost revenue, profit or data, or for
26	* direct, indirect, special, consequential, incidental or punitive
27	* damages, however caused and regardless of the theory of liability,
28	* arising out of the use of or inability to use software, even if the
29	* University of Notre Dame has been advised of the possibility of
30	* such damages.
31	*
32	* SUPPORT OPEN SCIENCE! If you use OpenMD or its source code in your
33	* research, please cite the appropriate papers when you publish your
34	* work. Good starting points are:
35	*
36	* [1] Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).
37	* [2] Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).
38	* [3] Sun, Lin & Gezelter, J. Chem. Phys. 128, 24107 (2008).
39	* [4] Kuang & Gezelter, J. Chem. Phys. 133, 164101 (2010).
40	* [5] Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
41	*/
42
43	#ifndef UTILS_MULTISTREAMBUF_HPP
44	#define UTILS_MULTISTREAMBUF_HPP
45	#include <streambuf>
46	#include <vector>
47	namespace OpenMD {
48
49	/**
50	* @class basic_teebuf basic_teebuf.hpp "utils/basic_teebuf.hpp"
51	* @brief As a subclass of basic_streambuf, basic_teebuf can operate on multiple stream simultaneously.
52	* @code
53	* std::ofstream file1("file1");
54	* std::ofstream file2("file22");
55	* std::vector<std::streambuf*> buffers;
56	* buffers.push_back(file1.rdbuf());
57	* buffers.push_back(file2.rdbuf());
58	* teebuf tmp(buffers.begin(), buffers.end());
59	* std::ostream myOs(&tmp);
60	* myOs << "hello world";
61	* @endcode
62	*/
63
64	template <class CharT, class Traits = std::char_traits<CharT> >
65	class basic_teebuf: public std::basic_streambuf<CharT, Traits> {
66	public:
67	typedef std::basic_streambuf<CharT, Traits> streambuf_type;
68	typedef Traits traits_type;
69	typedef CharT char_type;
70	typedef typename traits_type::int_type int_type;
71
72	template <typename ForwardIterator>
73	basic_teebuf(ForwardIterator begin, ForwardIterator end) : buffers_(begin, end){
74
75	}
76
77	protected:
78	int_type overflow(int_type c = traits_type::eof()) {
79
80	//avoid writing eof to stream
81	if (c == traits_type::eof()) {
82	return traits_type::eof();
83	}
84
85	typename std::vector<streambuf_type*>::iterator iter; //typename is needed since it's a dependant name
86	for (iter = buffers_.begin(); iter != buffers_.end(); ++iter) {
87	if ((*iter)->sputc(c) == traits_type::eof()) {
88	return traits_type::eof();
89	}
90	}
91
92	return traits_type::not_eof(c);
93	}
94
95	int sync() {
96
97	//flush buffer, checking return for eof.
98	if (traits_type::eq_int_type(overflow(traits_type::eof()), traits_type::eof())) {
99	return -1;
100	}
101
102	//flush streams
103	typename std::vector<streambuf_type*>::iterator iter;
104	for (iter = buffers_.begin(); iter != buffers_.end(); ++iter) {
105	if ((*iter)->pubsync() == -1) {
106	return -1;
107	}
108	}
109
110	return 0;
111	}
112
113	private:
114	std::vector<streambuf_type*> buffers_;
115	};
116
117	typedef basic_teebuf<char> TeeBuf;
118
119	}
120	#endif