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A class or built-in type X
models the Readable Iterator concept for
value type T
if, in addition
to X
being Assignable and
Copy Constructible, the following expressions are valid and respect the
stated semantics. U
is
the type of any specified member of type T
.
Table 1.1. Readable Iterator Requirements (in addition to Assignable and Copy Constructible)
Expression |
Return Type |
Note/Precondition |
---|---|---|
|
|
Any non-reference, non cv-qualified type |
|
Convertible to |
pre: |
|
|
pre: |
A class or built-in type X
models the Writable Iterator concept if,
in addition to X
being
Copy Constructible, the following expressions are valid and respect the
stated semantics. Writable Iterators have an associated set
of value types.
Table 1.2. Writable Iterator Requirements (in addition to Copy Constructible)
Expression |
Return Type |
Precondition |
---|---|---|
|
pre: The type of |
A class or built-in type X
models the Swappable Iterator concept
if, in addition to X
being
Copy Constructible, the following expressions are valid and respect the
stated semantics.
Table 1.3. Swappable Iterator Requirements (in addition to Copy Constructible)
Expression |
Return Type |
Postcondition |
---|---|---|
|
|
the pointed to values are exchanged |
Note: An iterator that is a model of the Readable and Writable Iterator concepts is also a model of Swappable Iterator. --end note
The Lvalue Iterator concept adds the requirement
that the return type of operator*
type be a reference to the value type
of the iterator.
Table 1.4. Lvalue Iterator Requirements
Expression |
Return Type |
Note/Assertion |
---|---|---|
|
|
|