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Bidirectional_Iterators (3)
  • >> Bidirectional_Iterators (3) ( Solaris man: Библиотечные вызовы )
  • 
                           Standard C++ Library
                 Copyright 1998, Rogue Wave Software, Inc.
    
    
    NAME
         Bidirectional_Iterators
    
          - An iterator that can both read and write and can traverse
         a container in both directions
    
    
    
    DESCRIPTION
         NOTE:
            For a complete discussion of iterators, see the Iterators
            section of this reference.
    
    
    
         Iterators are a generalization of pointers that allow a  C++
         program  to  uniformly  interact  with different data struc-
         tures. Bidirectional iterators can move  both  forwards  and
         backwards  through a container, and have the ability to both
         read and write data. These iterators  satisfy  the  require-
         ments listed below.
    
    
    
    KEY TO ITERATOR REQUIREMENTS
         The following key  pertains  to  the  iterator  descriptions
         listed below:
    
         a and b   values of type X
    
    
    
         n   value representing a distance between two iterators
    
    
    
         u, Distance, tmp and m   identifiers
    
    
    
         r   value of type X&
    
    
    
         t   value of type T
    
    REQUIREMENTS FOR BIDIRECTIONAL ITERATORS
         A bidirectional iterator  must  meet  all  the  requirements
         listed  below. Note that most of these requirements are also
         the requirements for forward iterators.
    
         X u   u might have a singular value
    
    
    
         X()   X() might be singular
    
    
    
         X(a)   copy constructor, a == X(a)
    
    
    
         X u(a)   copy constructor, u == a
    
    
    
         X u = a   assignment, u == a
    
    
    
         r = a   assignment, r == a
    
    
    
         a == b, a != b   return value convertible to bool
    
    
    
         a->m   equivalent to (*a).m
    
    
    
         *a   return value convertible to T&
    
    
    
         ++r   returns X&
    
    
    
         r++   return value convertible to const X&
    
    
    
         *r++   returns T&
    
    
         --r   returns X&
    
    
    
         r--   return value convertible to const X&
    
    
    
         *r--   returns T&
    
    
    
         Like forward iterators,  bidirectional  iterators  have  the
         condition that a == b implies *a== *b.
    
         There are no restrictions on the number of passes  an  algo-
         rithm may make through the structure.
    
    
    
    SEE ALSO
         Containers, Iterators, Forward_Iterators
    
    
    
    


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