problem passing list iterator

[vfunc]

I want to pass a list "node" to a function, read only access of the
list is fine, this is the relevant code I have so far

typedef std::vector<double> myvec;
typedef std::list<myvec> mylist; // a list of vectors
typedef mylist::const_iterator myiter;

void a(myiter &x)
{
int i;
....
// do something with
x[i]
};

The compiler does not like x[i]
"no match for operator [] .."
why is that?

How can I access the node like as if it were a myvec (by reference is
nice if that is OK).

Thanks.

[Kai-Uwe Bux]

vf***@talktalk.net wrote:

I want to pass a list "node" to a function, read only access of the
list is fine, this is the relevant code I have so far

typedef std::vector<double> myvec;
typedef std::list<myvec> mylist; // a list of vectors
typedef mylist::const_iterator myiter;

void a(myiter &x)
{
int i;
...
// do something with
x[i]
Try:

(*x)[i]

or

x->operator[](i)

or, if you want range checking

x->at(i)
};

The compiler does not like x[i]
"no match for operator [] .."
why is that?
The object x is not a vector but an iterator pointing to a vector.
How can I access the node like as if it were a myvec (by reference is
nice if that is OK).

see above.
Best

Kai-Uwe Bux

[vfunc]

Thanks for that. I have one remaining related problem now, the
function

void b(myiter &a)

compiles OK, but when it is called with

myiter x;
....
b(x++)

the compiler complains "no matching function call..."

[vfunc]

vf***@talktalk.net wrote:

Thanks for that. I have one remaining related problem now, the
function

void b(myiter &a)

compiles OK, but when it is called with

myiter x;
...
b(x++)

the compiler complains "no matching function call..."

OK, it was the ++ it did not like.