Output_Iterators(3C++) - Output_Iterators(3C++)
Standard C++ Library Copyright 1998, Rogue Wave Software, Inc.
NAMEOutput_Iterators
- A write-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. 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
Rogue Wave Software 02 Apr 1998 Output_Iterators(3C++)
