Input_Iterators man page on SunOS

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Input_Iterators(3C++)		       -		 Input_Iterators(3C++)

Standard C++ Library Copyright 1998, Rogue Wave Software, Inc.

NAME
       Input_Iterators

	- A read-only, forward moving iterator.

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 structures. Input iterators are
       read-only, forward  moving  iterators  that  satisfy  the  requirements
       listed below.

KEY TO ITERATOR REQUIREMENTS
       The  following  key  pertains  to the iterator requirement 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 INPUT ITERATORS
       The following expressions must be valid for input iterators:

       X u(a)	copy constructor, u == a

       X u = a	 assignment, u == a

       a == b, a != b	return value convertible to bool

       *a   a == b implies *a == *b

       ++r   returns X&

       r++   return value convertible to const X&

       *r++   returns type T

       a -> m	returns (*a).m

       For input iterators, a == b does not imply that ++a == ++b.

       Algorithms using input iterators should be single pass algorithms. That
       is, they should not pass through the same iterator twice.

       The value of type T does not have to be an lvalue.

SEE ALSO
       Iterators, Output_Iterators

Rogue Wave Software		  02 Apr 1998		 Input_Iterators(3C++)
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