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. Acknowledgement of the program authors must be made in any
 *    publication of scientific results based in part on use of the
 *    program.  An acceptable form of acknowledgement is citation of
 *    the article in which the program was described (Matthew
 *    A. Meineke, Charles F. Vardeman II, Teng Lin, Christopher
 *    J. Fennell and J. Daniel Gezelter, "OOPSE: An Object-Oriented
 *    Parallel Simulation Engine for Molecular Dynamics,"
 *    J. Comput. Chem. 26, pp. 252-271 (2005))
 *
 * 2. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 3. 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.
 */

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

  /**
   * @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:	2204
Committed:	Fri Apr 15 22:04:00 2005 UTC (19 years, 2 months ago) by gezelter
File size:	4244 byte(s)
Log Message:	xemacs has been drafted to perform our indentation services
#	User	Rev	Content
1	gezelter	2204	/*
2	tim	2060	* 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. Acknowledgement of the program authors must be made in any
10			* publication of scientific results based in part on use of the
11			* program. An acceptable form of acknowledgement is citation of
12			* the article in which the program was described (Matthew
13			* A. Meineke, Charles F. Vardeman II, Teng Lin, Christopher
14			* J. Fennell and J. Daniel Gezelter, "OOPSE: An Object-Oriented
15			* Parallel Simulation Engine for Molecular Dynamics,"
16			* J. Comput. Chem. 26, pp. 252-271 (2005))
17			*
18			* 2. Redistributions of source code must retain the above copyright
19			* notice, this list of conditions and the following disclaimer.
20			*
21			* 3. Redistributions in binary form must reproduce the above copyright
22			* notice, this list of conditions and the following disclaimer in the
23			* documentation and/or other materials provided with the
24			* distribution.
25			*
26			* This software is provided "AS IS," without a warranty of any
27			* kind. All express or implied conditions, representations and
28			* warranties, including any implied warranty of merchantability,
29			* fitness for a particular purpose or non-infringement, are hereby
30			* excluded. The University of Notre Dame and its licensors shall not
31			* be liable for any damages suffered by licensee as a result of
32			* using, modifying or distributing the software or its
33			* derivatives. In no event will the University of Notre Dame or its
34			* licensors be liable for any lost revenue, profit or data, or for
35			* direct, indirect, special, consequential, incidental or punitive
36			* damages, however caused and regardless of the theory of liability,
37			* arising out of the use of or inability to use software, even if the
38			* University of Notre Dame has been advised of the possibility of
39			* such damages.
40			*/
41
42			#ifndef UTILS_MULTISTREAMBUF_HPP
43			#define UTILS_MULTISTREAMBUF_HPP
44			#include <streambuf>
45			#include <vector>
46			namespace oopse {
47
48	gezelter	2204	/**
49			* @class basic_teebuf basic_teebuf.hpp "utils/basic_teebuf.hpp"
50			* @brief As a subclass of basic_streambuf, basic_teebuf can operate on multiple stream simultaneously.
51			* @code
52			* std::ofstream file1("file1");
53			* std::ofstream file2("file22");
54			* std::vector<std::streambuf*> buffers;
55			* buffers.push_back(file1.rdbuf());
56			* buffers.push_back(file2.rdbuf());
57			* teebuf tmp(buffers.begin(), buffers.end());
58			* std::ostream myOs(&tmp);
59			* myOs << "hello world";
60			* @endcode
61			*/
62	tim	2060
63	gezelter	2204	template <class CharT, class Traits = std::char_traits<CharT> >
64			class basic_teebuf: public std::basic_streambuf<CharT, Traits> {
65			public:
66			typedef std::basic_streambuf<CharT, Traits> streambuf_type;
67			typedef Traits traits_type;
68			typedef CharT char_type;
69			typedef typename traits_type::int_type int_type;
70	tim	2060
71	gezelter	2204	template <typename ForwardIterator>
72			basic_teebuf(ForwardIterator begin, ForwardIterator end) : buffers_(begin, end){
73	tim	2060
74	gezelter	2204	}
75	tim	2060
76	gezelter	2204	protected:
77			int_type overflow(int_type c = traits_type::eof()) {
78	tim	2060
79	gezelter	2204	//avoid writing eof to stream
80			if (c == traits_type::eof()) {
81			return traits_type::eof();
82			}
83	tim	2060
84	gezelter	2204	typename std::vector<streambuf_type*>::iterator iter; //typename is needed since it's a dependant name
85			for (iter = buffers_.begin(); iter != buffers_.end(); ++iter) {
86			if ((*iter)->sputc(c) == traits_type::eof()) {
87			return traits_type::eof();
88			}
89			}
90	tim	2060
91	gezelter	2204	return traits_type::not_eof(c);
92			}
93	tim	2060
94	gezelter	2204	int sync() {
95	tim	2060
96	gezelter	2204	//flush buffer, checking return for eof.
97			if (traits_type::eq_int_type(overflow(traits_type::eof()), traits_type::eof())) {
98			return -1;
99			}
100	tim	2060
101	gezelter	2204	//flush streams
102			typename std::vector<streambuf_type*>::iterator iter;
103			for (iter = buffers_.begin(); iter != buffers_.end(); ++iter) {
104			if ((*iter)->pubsync() == -1) {
105			return -1;
106			}
107			}
108	tim	2060
109	gezelter	2204	return 0;
110			}
111	tim	2060
112	gezelter	2204	private:
113			std::vector<streambuf_type*> buffers_;
114			};
115	tim	2060
116	gezelter	2204	typedef basic_teebuf<char> TeeBuf;
117	tim	2060
118			}
119			#endif