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mostream.hh
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34 
35 /*===========================================================================*\
36  * *
37  * $Revision: 1188 $ *
38  * $Date: 2015-01-05 16:34:10 +0100 (Mo, 05 Jan 2015) $ *
39  * *
40 \*===========================================================================*/
41 
42 //=============================================================================
43 //
44 // multiplex streams & ultilities
45 //
46 //=============================================================================
47 
48 #ifndef OPENMESH_MOSTREAM_HH
49 #define OPENMESH_MOSTREAM_HH
50 
51 
52 //== INCLUDES =================================================================
53 
54 #include <OpenMesh/Core/System/config.h>
55 #include <iostream>
56 #if defined( OM_CC_GCC ) && OM_CC_VERSION < 30000
57 # include <streambuf.h>
58 #else
59 # include <streambuf>
60 #endif
61 #include <vector>
62 #include <map>
63 #include <string>
64 #include <algorithm>
65 
66 
67 //== NAMESPACES ===============================================================
68 
69 namespace OpenMesh {
70 #ifndef DOXY_IGNORE_THIS
71 
72 
73 //== CLASS DEFINITION =========================================================
74 
75 
76 class basic_multiplex_target
77 {
78 public:
79  virtual ~basic_multiplex_target() {}
80  virtual void operator<<(const std::string& _s) = 0;
81 };
82 
83 
84 template <class T>
85 class multiplex_target : public basic_multiplex_target
86 {
87 public:
88  multiplex_target(T& _t) : target_(_t) {}
89  virtual void operator<<(const std::string& _s) { target_ << _s; }
90 private:
91  T& target_;
92 };
93 
94 
95 
96 //== CLASS DEFINITION =========================================================
97 
98 
99 #if defined( OM_CC_GCC ) && OM_CC_VERSION < 30000
100 # define STREAMBUF streambuf
101 # define INT_TYPE int
102 # define TRAITS_TYPE
103 #else
104 # define STREAMBUF std::basic_streambuf<char>
105 #endif
106 
107 class multiplex_streambuf : public STREAMBUF
108 {
109 public:
110 
111  typedef STREAMBUF base_type;
112 #if defined( OM_CC_GCC ) && OM_CC_VERSION < 30000
113  typedef int int_type;
114  struct traits_type
115  {
116  static int_type eof() { return -1; }
117  static char to_char_type(int_type c) { return char(c); }
118  };
119 #else
120  typedef base_type::int_type int_type;
121  typedef base_type::traits_type traits_type;
122 #endif
123 
124  // Constructor
125  multiplex_streambuf() : enabled_(true) { buffer_.reserve(100); }
126 
127  // Destructor
128  ~multiplex_streambuf()
129  {
130  tmap_iter t_it(target_map_.begin()), t_end(target_map_.end());
131  for (; t_it!=t_end; ++t_it)
132  delete t_it->second;
133  }
134 
135 
136  // buffer enable/disable
137  bool is_enabled() const { return enabled_; }
138  void enable() { enabled_ = true; }
139  void disable() { enabled_ = false; }
140 
141 
142  // construct multiplex_target<T> and add it to targets
143  template <class T> bool connect(T& _target)
144  {
145  void* key = (void*) &_target;
146 
147  if (target_map_.find(key) != target_map_.end())
148  return false;
149 
150  target_type* mtarget = new multiplex_target<T>(_target);
151  target_map_[key] = mtarget;
152 
153  __connect(mtarget);
154  return true;
155  }
156 
157 
158  // disconnect target from multiplexer
159  template <class T> bool disconnect(T& _target)
160  {
161  void* key = (void*) &_target;
162  tmap_iter t_it = target_map_.find(key);
163 
164  if (t_it != target_map_.end())
165  {
166  __disconnect(t_it->second);
167  target_map_.erase(t_it);
168  return true;
169  }
170 
171  return false;
172  }
173 
174 
175 protected:
176 
177  // output what's in buffer_
178  virtual int sync()
179  {
180  if (!buffer_.empty())
181  {
182  if (enabled_) multiplex();
183 #if defined( OM_CC_GCC ) && OM_CC_VERSION < 30000
184  buffer_ = ""; // member clear() not available!
185 #else
186  buffer_.clear();
187 #endif
188  }
189  return base_type::sync();
190  }
191 
192 
193  // take on char and add it to buffer_
194  // if '\n' is encountered, trigger a sync()
195  virtual
196  int_type overflow(int_type _c = multiplex_streambuf::traits_type::eof())
197  {
198  char c = traits_type::to_char_type(_c);
199  buffer_.push_back(c);
200  if (c == '\n') sync();
201  return 0;
202  }
203 
204 
205 private:
206 
207  typedef basic_multiplex_target target_type;
208  typedef std::vector<target_type*> target_list;
209  typedef target_list::iterator tlist_iter;
210  typedef std::map<void*, target_type*> target_map;
211  typedef target_map::iterator tmap_iter;
212 
213 
214  // add _target to list of multiplex targets
215  void __connect(target_type* _target) { targets_.push_back(_target); }
216 
217 
218  // remove _target from list of multiplex targets
219  void __disconnect(target_type* _target) {
220  targets_.erase(std::find(targets_.begin(), targets_.end(), _target));
221  }
222 
223 
224  // multiplex output of buffer_ to all targets
225  void multiplex()
226  {
227  tlist_iter t_it(targets_.begin()), t_end(targets_.end());
228  for (; t_it!=t_end; ++t_it)
229  **t_it << buffer_;
230  }
231 
232 
233 private:
234 
235  target_list targets_;
236  target_map target_map_;
237  std::string buffer_;
238  bool enabled_;
239 };
240 
241 #undef STREAMBUF
242 
243 
244 //== CLASS DEFINITION =========================================================
245 
246 
256 class mostream : public std::ostream
257 {
258 public:
259 
261  explicit mostream() : std::ostream(NULL) { init(&streambuffer_); }
262 
263 
265  template <class T> bool connect(T& _target)
266  {
267  return streambuffer_.connect(_target);
268  }
269 
270 
272  template <class T> bool disconnect(T& _target)
273  {
274  return streambuffer_.disconnect(_target);
275  }
276 
277 
279  bool is_enabled() const { return streambuffer_.is_enabled(); }
280 
282  void enable() { streambuffer_.enable(); }
283 
285  void disable() { streambuffer_.disable(); }
286 
287 
288 private:
289  multiplex_streambuf streambuffer_;
290 };
291 
292 
293 //=============================================================================
294 #endif
295 } // namespace OpenMesh
296 //=============================================================================
297 #endif // OPENMESH_MOSTREAM_HH defined
298 //=============================================================================
STL namespace.
std::ostream & operator<<(std::ostream &_os, const BaseHandle &_hnd)
Write handle _hnd to stream _os.
Definition: Handles.hh:104
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition: MeshItems.hh:56

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