STL iterators std::distance() error

Question

I'm having such two typedefs:

typedef std::vector<int> Container;
typedef std::vector<int>::const_iterator Iter;

In the problem that I consider, I perform some operations on Container Input, and after that I would like to compute std::distance(Input.begin(),itTarget), where itTarget is of the Iter type. But I'm getting this compiler error that no instance of function template "std::distance" matches the argument list, and only after casting, i.e., std::distance(static_cast<Iter>(Input.begin()),itTarget) everything works fine.

I wonder why is that?

Answer 1

std::distance is a template function, it can't accept different parameters. You need to use:

std::distance(Input.cbegin(),itTarget);
                    ^^

see std::vector::cbegin link