Standard C++	Library
 		 Copyright 1996, Rogue Wave Software, Inc.

 NAME

   Output_Iterators  - A	write-only, forward moving iterator.

 DESCRIPTION

   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.  Output
   iterators are write-only, forward moving iterators that satisfy the
   requirements listed below.  Note that unlike other iterators used
   with the standard library, output iterators cannot be constant.

 KEY TO ITERATOR	REQUIREMENTS

   The following	key pertains to	the iterator requirements listed
   below:

   a and	b   values of type X

   n   value of distance	type

   u, Distance, tmp and m   identifiers

   r   value of type X&

   t   value of type T

 REQUIREMENTS FOR OUTPUT	ITERATORS

   The following	expressions must be valid for output iterators:

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

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

   X u =	a   assignment,	u == a

   *a = t   result is not used

   ++r	returns	X&

   r++	return value convertible to const X&

   *r++ = t   result is not used

   The only valid use for the operator *	is on the left hand side of
   the assignment statement.

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

 SEE ALSO

   Iterators, Input Iterators

 STANDARDS CONFORMANCE
   ANSI X3J16/ISO WG21 Joint C++	Committee