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Output Iterators
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Output Iterators
Iterator
- Summary
- Data Type and Member Function Indexes
- Description
- Key to Iterator Requirements
- Requirements for Output Iterators
- See Also
Summary
A write-only, forward moving iterator.
Data Type and Member Function Indexes
(exclusive of constructors and destructors)
None
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
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