Changeset - r20:9244aa9ec12e
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alpar (Alpar Juttner)
alpar@cs.elte.hu
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0 files changed with 3 insertions and 3 deletions:
lemon/bits/invalid.h
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lemon/bits/invalid.h
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///\file


			




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///\brief Definition of INVALID.


			




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namespace lemon {


			




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  /// \brief Dummy type to make it easier to make invalid iterators.


			




	
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  /// \brief Dummy type to make it easier to create invalid iterators.


			




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  ///


			




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  /// See \ref INVALID for the usage.


			




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  struct Invalid {


			




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  public:


			




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    bool operator==(Invalid) { return true;  }


			




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    bool operator!=(Invalid) { return false; }


			




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    bool operator< (Invalid) { return false; }


			




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  };


			




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  /// Invalid iterators.


			




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  /// \brief Invalid iterators.


			




	
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  ///


			




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  /// \ref Invalid is a global type that converts to each iterator


			




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  /// in such a way that the value of the target iterator will be invalid.


			




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  //Some people didn't like this:


			




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  //const Invalid &INVALID = *(Invalid *)0;


			




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