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alpar (Alpar Juttner)
alpar@cs.elte.hu
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@defgroup lemon_io Lemon Input-Output
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@ingroup io_group
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\brief Reading and writing LEMON format
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This group describes methods for reading and writing LEMON format. 
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You can find more about this format on the \ref graph-io-page "Graph Input-Output"
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tutorial pages.
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*/
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/**
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@defgroup section_io Section readers and writers
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@ingroup lemon_io
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\brief Section readers and writers for lemon Input-Output.
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\brief Section readers and writers for LEMON Input-Output.
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This group describes section readers and writers that can be attached to
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\ref LemonReader and \ref LemonWriter.
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This group describes section reader and writer classes that can be 
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attached to \ref LemonReader and \ref LemonWriter.
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*/
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/**
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@defgroup item_io Item Readers and Writers
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@defgroup item_io Item readers and writers
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@ingroup lemon_io
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\brief Item readers and writers for lemon Input-Output.
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\brief Item readers and writers for LEMON Input-Output.
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The Input-Output classes can handle more data type by example
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as map or attribute value. Each of these should be written and
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read some way. The module make possible to do this.  
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This group describes reader and writer classes for various data types
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(e.g. map or attribute values). These classes can be attached to
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\ref LemonReader and \ref LemonWriter.
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*/
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/**
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@defgroup eps_io Postscript exporting
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@ingroup io_group
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\brief General \c EPS drawer and graph exporter
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This group describes general \c EPS drawing methods and special
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graph exporting tools. 
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*/
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  /// \addtogroup misc
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  /// @{
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  ///\brief A class to provide a basic way to
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  ///handle the comparison of numbers that are obtained
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  ///as a result of a probably inexact computation.
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  ///
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  ///\ref Tolerance is a class to provide a basic way to
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  ///handle the comparison of numbers that are obtained
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  ///as a result of a probably inexact computation.
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  ///
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  ///This is an abstract class, it should be specialized for all numerical
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  ///data types. These specialized classes like \ref Tolerance<double>
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  ///may offer additional tuning parameters.
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  ///This is an abstract class, it should be specialized for all 
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  ///numerical data types. These specialized classes like 
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  ///Tolerance<double> may offer additional tuning parameters.
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  ///
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  ///\sa Tolerance<float>
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  ///\sa Tolerance<double>
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  ///\sa Tolerance<long double>
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  ///\sa Tolerance<int>
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  ///\sa Tolerance<long long int>
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  ///\sa Tolerance<unsigned int>
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  ///\sa Tolerance<unsigned long long int>
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  template<class T>
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  class Tolerance
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  {
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    ///Returns the epsilon value.
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    Value epsilon() const {return _epsilon;}
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    ///Sets the epsilon value.
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    void epsilon(Value e) {_epsilon=e;}
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    ///Returns the default epsilon value.
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    static Value defaultEpsilon() {return def_epsilon;}
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    ///Sets the default epsilon value.
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    static void defaultEpsilon(Value e) {def_epsilon=e;}
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    ///\name Comparisons
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    ///See \ref Tolerance for more details.
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    ///See \ref lemon::Tolerance "Tolerance" for more details.
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    ///@{
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    ///Returns \c true if \c a is \e surely strictly less than \c b
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    bool less(Value a,Value b) const {return a+_epsilon<b;}
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    ///Returns \c true if \c a is \e surely different from \c b
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    bool different(Value a,Value b) const { return less(a,b)||less(b,a); }
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    ///Returns \c true if \c a is \e surely positive
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    bool positive(Value a) const { return _epsilon<a; }
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    ///Returns \c true if \c a is \e surely negative
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    bool negative(Value a) const { return -_epsilon>a; }
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    ///Returns \c true if \c a is \e surely non-zero
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    ///Returns the epsilon value.
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    Value epsilon() const {return _epsilon;}
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    ///Sets the epsilon value.
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    void epsilon(Value e) {_epsilon=e;}
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    ///Returns the default epsilon value.
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    static Value defaultEpsilon() {return def_epsilon;}
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    ///Sets the default epsilon value.
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    static void defaultEpsilon(Value e) {def_epsilon=e;}
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    ///\name Comparisons
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    ///See \ref Tolerance for more details.
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    ///See \ref lemon::Tolerance "Tolerance" for more details.
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    ///@{
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    ///Returns \c true if \c a is \e surely strictly less than \c b
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    bool less(Value a,Value b) const {return a+_epsilon<b;}
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    ///Returns \c true if \c a is \e surely different from \c b
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    bool different(Value a,Value b) const { return less(a,b)||less(b,a); }
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    ///Returns \c true if \c a is \e surely positive
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    bool positive(Value a) const { return _epsilon<a; }
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    ///Returns \c true if \c a is \e surely negative
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    bool negative(Value a) const { return -_epsilon>a; }
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    ///Returns \c true if \c a is \e surely non-zero
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    ///Returns the epsilon value.
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    Value epsilon() const {return _epsilon;}
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    ///Sets the epsilon value.
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    void epsilon(Value e) {_epsilon=e;}
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    ///Returns the default epsilon value.
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    static Value defaultEpsilon() {return def_epsilon;}
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    ///Sets the default epsilon value.
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    static void defaultEpsilon(Value e) {def_epsilon=e;}
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    ///\name Comparisons
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    ///See \ref Tolerance for more details.
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    ///See \ref lemon::Tolerance "Tolerance" for more details.
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    ///@{
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    ///Returns \c true if \c a is \e surely strictly less than \c b
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    bool less(Value a,Value b) const {return a+_epsilon<b;}
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    ///Returns \c true if \c a is \e surely different from \c b
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    bool different(Value a,Value b) const { return less(a,b)||less(b,a); }
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    ///Returns \c true if \c a is \e surely positive
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    bool positive(Value a) const { return _epsilon<a; }
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    ///Returns \c true if \c a is \e surely negative
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    bool negative(Value a) const { return -_epsilon>a; }
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    ///Returns \c true if \c a is \e surely non-zero
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  ///Integer specialization of Tolerance.
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  ///Integer specialization of Tolerance.
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  ///\sa Tolerance
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  template<>
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  class Tolerance<int>
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  {
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  public:
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    ///\e
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    typedef int Value;
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    ///\name Comparisons
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    ///See \ref Tolerance for more details.
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    ///See \ref lemon::Tolerance "Tolerance" for more details.
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    ///@{
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    ///Returns \c true if \c a is \e surely strictly less than \c b
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    static bool less(Value a,Value b) { return a<b;}
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    ///Returns \c true if \c a is \e surely different from \c b
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    static bool different(Value a,Value b) { return a!=b; }
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    ///Returns \c true if \c a is \e surely positive
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    static bool positive(Value a) { return 0<a; }
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    ///Returns \c true if \c a is \e surely negative
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    static bool negative(Value a) { return 0>a; }
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    ///Returns \c true if \c a is \e surely non-zero
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    static bool nonZero(Value a) { return a!=0; }
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    ///@}
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    ///Returns zero
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    static Value zero() {return 0;}
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  };
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  ///Unsigned integer specialization of Tolerance.
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  ///Unsigned integer specialization of \ref Tolerance.
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  ///Unsigned integer specialization of Tolerance.
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  ///\sa Tolerance
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  template<>
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  class Tolerance<unsigned int>
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  {
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  public:
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    ///\e
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    typedef unsigned int Value;
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    ///\name Comparisons
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    ///See \ref Tolerance for more details.
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    ///See \ref lemon::Tolerance "Tolerance" for more details.
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    ///@{
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    ///Returns \c true if \c a is \e surely strictly less than \c b
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    static bool less(Value a,Value b) { return a<b;}
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    ///Returns \c true if \c a is \e surely different from \c b
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    static bool different(Value a,Value b) { return a!=b; }
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    ///Returns \c true if \c a is \e surely positive
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    static bool positive(Value a) { return 0<a; }
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    ///Returns \c true if \c a is \e surely negative
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    static bool negative(Value) { return false; }
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    ///Returns \c true if \c a is \e surely non-zero
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  ///Long integer specialization of Tolerance.
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  ///Long integer specialization of Tolerance.
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  ///\sa Tolerance
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  template<>
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  class Tolerance<long int>
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  {
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  public:
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    ///\e
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    typedef long int Value;
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    ///\name Comparisons
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    ///See \ref Tolerance for more details.
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    ///See \ref lemon::Tolerance "Tolerance" for more details.
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    ///@{
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    ///Returns \c true if \c a is \e surely strictly less than \c b
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    static bool less(Value a,Value b) { return a<b;}
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    ///Returns \c true if \c a is \e surely different from \c b
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    static bool different(Value a,Value b) { return a!=b; }
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    ///Returns \c true if \c a is \e surely positive
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    static bool positive(Value a) { return 0<a; }
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    ///Returns \c true if \c a is \e surely negative
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    static bool negative(Value a) { return 0>a; }
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    ///Returns \c true if \c a is \e surely non-zero
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    static bool nonZero(Value a) { return a!=0;}
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    ///@}
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    ///Returns zero
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    static Value zero() {return 0;}
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  };
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  ///Unsigned long integer specialization of Tolerance.
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  ///Unsigned long integer specialization of \ref Tolerance.
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  ///Unsigned long integer specialization of Tolerance.
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  ///\sa Tolerance
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  template<>
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  class Tolerance<unsigned long int>
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  {
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  public:
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    ///\e
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    typedef unsigned long int Value;
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    ///\name Comparisons
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    ///See \ref Tolerance for more details.
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    ///See \ref lemon::Tolerance "Tolerance" for more details.
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    ///@{
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    ///Returns \c true if \c a is \e surely strictly less than \c b
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    static bool less(Value a,Value b) { return a<b;}
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    ///Returns \c true if \c a is \e surely different from \c b
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    static bool different(Value a,Value b) { return a!=b; }
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    ///Returns \c true if \c a is \e surely positive
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    static bool positive(Value a) { return 0<a; }
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    ///Returns \c true if \c a is \e surely negative
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    static bool negative(Value) { return false; }
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    ///Returns \c true if \c a is \e surely non-zero
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    static bool nonZero(Value a) { return a!=0;}
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    ///@}
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    ///Returns zero
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    static Value zero() {return 0;}
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  };
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#if defined __GNUC__ && !defined __STRICT_ANSI__
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  ///Long long integer specialization of Tolerance.
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  ///Long long integer specialization of \ref Tolerance.
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  ///Long long integer specialization of Tolerance.
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  ///\warning This class (more exactly, type <tt>long long</tt>)
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  ///is not ansi compatible.
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  ///\sa Tolerance
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  template<>
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  class Tolerance<long long int>
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  {
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  public:
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    ///\e
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    typedef long long int Value;
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    ///\name Comparisons
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    ///See \ref Tolerance for more details.
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    ///See \ref lemon::Tolerance "Tolerance" for more details.
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    ///@{
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    ///Returns \c true if \c a is \e surely strictly less than \c b
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    static bool less(Value a,Value b) { return a<b;}
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    ///Returns \c true if \c a is \e surely different from \c b
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    static bool different(Value a,Value b) { return a!=b; }
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    ///Returns \c true if \c a is \e surely positive
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    static bool positive(Value a) { return 0<a; }
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    ///Returns \c true if \c a is \e surely negative
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    static bool negative(Value a) { return 0>a; }
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    ///Returns \c true if \c a is \e surely non-zero
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    static bool nonZero(Value a) { return a!=0;}
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    ///@}
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    ///Returns zero
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    static Value zero() {return 0;}
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  };
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  ///Unsigned long long integer specialization of Tolerance.
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  ///Unsigned long long integer specialization of \ref Tolerance.
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  ///Unsigned long long integer specialization of Tolerance.
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  ///\warning This class (more exactly, type <tt>unsigned long long</tt>)
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  ///is not ansi compatible.
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  ///\sa Tolerance
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  template<>
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  class Tolerance<unsigned long long int>
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  {
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  public:
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    ///\e
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    typedef unsigned long long int Value;
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    ///\name Comparisons
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    ///See \ref Tolerance for more details.
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    ///See \ref lemon::Tolerance "Tolerance" for more details.
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    ///@{
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    ///Returns \c true if \c a is \e surely strictly less than \c b
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    static bool less(Value a,Value b) { return a<b;}
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    ///Returns \c true if \c a is \e surely different from \c b
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    static bool different(Value a,Value b) { return a!=b; }
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    ///Returns \c true if \c a is \e surely positive
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    static bool positive(Value a) { return 0<a; }
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    ///Returns \c true if \c a is \e surely negative
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    static bool negative(Value) { return false; }
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    ///Returns \c true if \c a is \e surely non-zero
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