Special iterator

[KK]

Hello comp.lang.c++,
Is it possible to construct an iterator for a class that can traverse
through all the elements associated with that class?
Class AnotherDataType; //defined somewhere else
Class Crazy
{
int _num;
std::string _name;
unsinged int _index;
AnotherDataType _tmp;

Class Iterator
{
//define other necessary funcs elements
Iterator& operator++ () {
// IF the current element pointer is "_num" THEN return
pointer to "_name"
// IF the current element pointer is "_name" THEN return
pointer to "_index"
// IF the current element pointer is "_index" THEN return
pointer to "__tmp"
}
}
}
Any ideas on how to go about doing this?
Thanks.
-KK

[mlimber]

KK wrote:

Hello comp.lang.c++,
Is it possible to construct an iterator for a class that can traverse
through all the elements associated with that class?
Class AnotherDataType; //defined somewhere else
Class Crazy
{
int _num;
std::string _name;
unsinged int _index;
AnotherDataType _tmp;

Class Iterator
{
//define other necessary funcs elements
Iterator& operator++ () {
// IF the current element pointer is "_num" THEN return
pointer to "_name"
// IF the current element pointer is "_name" THEN return
pointer to "_index"
// IF the current element pointer is "_index" THEN return
pointer to "__tmp"
}
}
}
Any ideas on how to go about doing this?
Thanks.
-KK

You could use boost::any (http://boost.org/doc/html/any.html) or
boost::variant (http://boost.org/doc/html/variant.html) to accomplish
this.

Cheers! --M

[Michiel.Salters]

KK wrote:

Hello comp.lang.c++,
Is it possible to construct an iterator for a class that can traverse
through all the elements associated with that class?
Class AnotherDataType; //defined somewhere else
Class Crazy
{
int _num;
std::string _name;
unsinged int _index;
AnotherDataType _tmp;

Class Iterator
{
// IF the current element pointer is "_num" THEN return
pointer to "_name"
// IF the current element pointer is "_name" THEN return
pointer to "_index"
// IF the current element pointer is "_index" THEN return
pointer to "__tmp"

No. There's no return type for operator*

HTH,
Michiel Salters

[mlimber]

Mi*************@tomtom.com wrote:

KK wrote:

Hello comp.lang.c++,
Is it possible to construct an iterator for a class that can traverse
through all the elements associated with that class?
Class AnotherDataType; //defined somewhere else
Class Crazy
{
int _num;
std::string _name;
unsinged int _index;
AnotherDataType _tmp;

Class Iterator
{
// IF the current element pointer is "_num" THEN return
pointer to "_name"
// IF the current element pointer is "_name" THEN return
pointer to "_index"
// IF the current element pointer is "_index" THEN return
pointer to "__tmp"

No. There's no return type for operator*

Sure there is. That's how smart pointers work (cf. boost::scoped_ptr).

Cheers! --M