Changeset 486:7d7d9debb29a in lemon1.2 for lemon/tolerance.h
 Timestamp:
 02/20/09 19:06:10 (14 years ago)
 Branch:
 default
 Phase:
 public
 File:

 1 edited
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lemon/tolerance.h
r485 r486 39 39 ///as a result of a probably inexact computation. 40 40 /// 41 ///This is an abstract class, it should be specialized for all 42 ///numerical data types. These specialized classes like 41 ///The general implementation is suitable only if the data type is exact, 42 ///like the integer types, otherwise a specialized version must be 43 ///implemented. These specialized classes like 43 44 ///Tolerance<double> may offer additional tuning parameters. 44 45 /// … … 46 47 ///\sa Tolerance<double> 47 48 ///\sa Tolerance<long double> 48 ///\sa Tolerance<int>49 ///\sa Tolerance<long long int>50 ///\sa Tolerance<unsigned int>51 ///\sa Tolerance<unsigned long long int>52 49 53 50 template<class T> … … 65 62 66 63 ///Returns \c true if \c a is \e surely strictly less than \c b 67 static bool less(Value a,Value b) {return false;}68 ///Returns \c true if \c a is \e surely different from \c b 69 static bool different(Value a,Value b) {return false;}70 ///Returns \c true if \c a is \e surely positive 71 static bool positive(Value a) {return false;}72 ///Returns \c true if \c a is \e surely negative 73 static bool negative(Value a) {return false;}74 ///Returns \c true if \c a is \e surely nonzero 75 static bool nonZero(Value a) {return false;}64 static bool less(Value a,Value b) {return a<b;} 65 ///Returns \c true if \c a is \e surely different from \c b 66 static bool different(Value a,Value b) {return a!=b;} 67 ///Returns \c true if \c a is \e surely positive 68 static bool positive(Value a) {return static_cast<Value>(0) < a;} 69 ///Returns \c true if \c a is \e surely negative 70 static bool negative(Value a) {return a < static_cast<Value>(0);} 71 ///Returns \c true if \c a is \e surely nonzero 72 static bool nonZero(Value a) {return a != static_cast<Value>(0);} 76 73 77 74 ///@} 78 75 79 76 ///Returns the zero value. 80 static Value zero() {return T();}77 static Value zero() {return static_cast<Value>(0);} 81 78 82 79 // static bool finite(Value a) {} … … 239 236 }; 240 237 241 ///Integer specialization of Tolerance.242 243 ///Integer specialization of Tolerance.244 ///\sa Tolerance245 template<>246 class Tolerance<int>247 {248 public:249 ///\e250 typedef int Value;251 252 ///\name Comparisons253 ///See \ref lemon::Tolerance "Tolerance" for more details.254 255 ///@{256 257 ///Returns \c true if \c a is \e surely strictly less than \c b258 static bool less(Value a,Value b) { return a<b;}259 ///Returns \c true if \c a is \e surely different from \c b260 static bool different(Value a,Value b) { return a!=b; }261 ///Returns \c true if \c a is \e surely positive262 static bool positive(Value a) { return 0<a; }263 ///Returns \c true if \c a is \e surely negative264 static bool negative(Value a) { return 0>a; }265 ///Returns \c true if \c a is \e surely nonzero266 static bool nonZero(Value a) { return a!=0; }267 268 ///@}269 270 ///Returns zero271 static Value zero() {return 0;}272 };273 274 ///Unsigned integer specialization of Tolerance.275 276 ///Unsigned integer specialization of Tolerance.277 ///\sa Tolerance278 template<>279 class Tolerance<unsigned int>280 {281 public:282 ///\e283 typedef unsigned int Value;284 285 ///\name Comparisons286 ///See \ref lemon::Tolerance "Tolerance" for more details.287 288 ///@{289 290 ///Returns \c true if \c a is \e surely strictly less than \c b291 static bool less(Value a,Value b) { return a<b;}292 ///Returns \c true if \c a is \e surely different from \c b293 static bool different(Value a,Value b) { return a!=b; }294 ///Returns \c true if \c a is \e surely positive295 static bool positive(Value a) { return 0<a; }296 ///Returns \c true if \c a is \e surely negative297 static bool negative(Value) { return false; }298 ///Returns \c true if \c a is \e surely nonzero299 static bool nonZero(Value a) { return a!=0; }300 301 ///@}302 303 ///Returns zero304 static Value zero() {return 0;}305 };306 307 308 ///Long integer specialization of Tolerance.309 310 ///Long integer specialization of Tolerance.311 ///\sa Tolerance312 template<>313 class Tolerance<long int>314 {315 public:316 ///\e317 typedef long int Value;318 319 ///\name Comparisons320 ///See \ref lemon::Tolerance "Tolerance" for more details.321 322 ///@{323 324 ///Returns \c true if \c a is \e surely strictly less than \c b325 static bool less(Value a,Value b) { return a<b;}326 ///Returns \c true if \c a is \e surely different from \c b327 static bool different(Value a,Value b) { return a!=b; }328 ///Returns \c true if \c a is \e surely positive329 static bool positive(Value a) { return 0<a; }330 ///Returns \c true if \c a is \e surely negative331 static bool negative(Value a) { return 0>a; }332 ///Returns \c true if \c a is \e surely nonzero333 static bool nonZero(Value a) { return a!=0;}334 335 ///@}336 337 ///Returns zero338 static Value zero() {return 0;}339 };340 341 ///Unsigned long integer specialization of Tolerance.342 343 ///Unsigned long integer specialization of Tolerance.344 ///\sa Tolerance345 template<>346 class Tolerance<unsigned long int>347 {348 public:349 ///\e350 typedef unsigned long int Value;351 352 ///\name Comparisons353 ///See \ref lemon::Tolerance "Tolerance" for more details.354 355 ///@{356 357 ///Returns \c true if \c a is \e surely strictly less than \c b358 static bool less(Value a,Value b) { return a<b;}359 ///Returns \c true if \c a is \e surely different from \c b360 static bool different(Value a,Value b) { return a!=b; }361 ///Returns \c true if \c a is \e surely positive362 static bool positive(Value a) { return 0<a; }363 ///Returns \c true if \c a is \e surely negative364 static bool negative(Value) { return false; }365 ///Returns \c true if \c a is \e surely nonzero366 static bool nonZero(Value a) { return a!=0;}367 368 ///@}369 370 ///Returns zero371 static Value zero() {return 0;}372 };373 374 #if HAVE_LONG_LONG375 376 ///Long long integer specialization of Tolerance.377 378 ///Long long integer specialization of Tolerance.379 ///\warning This class (more exactly, type <tt>long long</tt>)380 ///is not ansi compatible.381 ///\sa Tolerance382 template<>383 class Tolerance<long long int>384 {385 public:386 ///\e387 typedef long long int Value;388 389 ///\name Comparisons390 ///See \ref lemon::Tolerance "Tolerance" for more details.391 392 ///@{393 394 ///Returns \c true if \c a is \e surely strictly less than \c b395 static bool less(Value a,Value b) { return a<b;}396 ///Returns \c true if \c a is \e surely different from \c b397 static bool different(Value a,Value b) { return a!=b; }398 ///Returns \c true if \c a is \e surely positive399 static bool positive(Value a) { return 0<a; }400 ///Returns \c true if \c a is \e surely negative401 static bool negative(Value a) { return 0>a; }402 ///Returns \c true if \c a is \e surely nonzero403 static bool nonZero(Value a) { return a!=0;}404 405 ///@}406 407 ///Returns zero408 static Value zero() {return 0;}409 };410 411 ///Unsigned long long integer specialization of Tolerance.412 413 ///Unsigned long long integer specialization of Tolerance.414 ///\warning This class (more exactly, type <tt>unsigned long long</tt>)415 ///is not ansi compatible.416 ///\sa Tolerance417 template<>418 class Tolerance<unsigned long long int>419 {420 public:421 ///\e422 typedef unsigned long long int Value;423 424 ///\name Comparisons425 ///See \ref lemon::Tolerance "Tolerance" for more details.426 427 ///@{428 429 ///Returns \c true if \c a is \e surely strictly less than \c b430 static bool less(Value a,Value b) { return a<b;}431 ///Returns \c true if \c a is \e surely different from \c b432 static bool different(Value a,Value b) { return a!=b; }433 ///Returns \c true if \c a is \e surely positive434 static bool positive(Value a) { return 0<a; }435 ///Returns \c true if \c a is \e surely negative436 static bool negative(Value) { return false; }437 ///Returns \c true if \c a is \e surely nonzero438 static bool nonZero(Value a) { return a!=0;}439 440 ///@}441 442 ///Returns zero443 static Value zero() {return 0;}444 };445 446 #endif447 448 238 /// @} 449 239
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