equal
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204 |
204 |
205 \code |
205 \code |
206 reader.run(); |
206 reader.run(); |
207 \endcode |
207 \endcode |
208 |
208 |
209 \section types The background of Reading and Writing |
209 \section types Background of Reading and Writing |
210 The \c GraphReader should know how to read a Value from the given map. |
210 To read a map (on the nodes or edges) |
|
211 the \c GraphReader should know how to read a Value from the given map. |
211 By the default implementation the input operator reads a value from |
212 By the default implementation the input operator reads a value from |
212 the stream and the type of the readed value is the value type of the given map. |
213 the stream and the type of the readed value is the value type of the given map. |
213 When the reader should skip a value in the stream, because you do not |
214 When the reader should skip a value in the stream, because you do not |
214 want to store it in map, the reader skips a character sequence without |
215 want to store it in a map, the reader skips a character sequence without |
215 whitespace. |
216 whitespace. |
216 |
217 |
217 If you want to change the functionality of the reader, you can use |
218 If you want to change the functionality of the reader, you can use |
218 template parameters to specialize it. When you give a reading |
219 template parameters to specialize it. When you give a reading |
219 command for a map you can give a Reader type as template parameter. |
220 command for a map you can give a Reader type as template parameter. |
227 |
228 |
228 void read(std::istream& is, Value& value); |
229 void read(std::istream& is, Value& value); |
229 }; |
230 }; |
230 \endcode |
231 \endcode |
231 |
232 |
232 By example, the \c "strings" nodemap contains strings and you do not need |
233 For example, the \c "strings" nodemap contains strings and you do not need |
233 the value of the string just the length. Then you can implement own Reader |
234 the value of the string just the length. Then you can implement own Reader |
234 struct. |
235 struct. |
235 |
236 |
236 \code |
237 \code |
237 struct LengthReader { |
238 struct LengthReader { |
251 special template parameter to the GraphReader class. By default, the |
252 special template parameter to the GraphReader class. By default, the |
252 template parameter is \c DefaultReaderTraits. A reader traits class |
253 template parameter is \c DefaultReaderTraits. A reader traits class |
253 should provide an inner template class Reader for each type, and an |
254 should provide an inner template class Reader for each type, and an |
254 DefaultReader for skipping a value. |
255 DefaultReader for skipping a value. |
255 |
256 |
256 The specialization of the writing should be very similar to the reading. |
257 The specialization of writing should be very similar to that of reading. |
257 |
258 |
258 \author Balazs Dezso |
259 \author Balazs Dezso |
259 */ |
260 */ |
260 } |
261 } |