Thread: problem calling function

I have a function:

Code:

list<Coord>::iterator partition(list<Coord>& mList, list<Coord>::iterator it){

    double x = it->get_x();
    double y = it->get_y();

    double dist = distance(x,y)/3;

    return it;
}

I'm getting this error when it reaches the call to the distance function:

Code:

/usr/include/c++/4.1.3/bits/stl_iterator_base_types.h: In instantiation of 'std::iterator_traits<double>’:
main3.cpp:205:   instantiated from here
/usr/include/c++/4.1.3/bits/stl_iterator_base_types.h:129: error: ‘double’ is not a class, struct, or union type

but if I just replace the function call with the distance formula itself, it works.

any ideas??

Originally Posted by tabstop

distance is a function from <iterator> that returns the distance between two iterators, and I think that might be causing problems. Sorry. Maybe call your distance function something else? We can at least see if that's what's causing problems.

Yeah, that was it. Amazing how I've never ran into that problem before using the name distance to denote a distance function. Does this problem arise only if you're using <iterator> or <list> or something of the sort?

Not including the header is too risky, because another header may well include it.