how to detect if a type is an iterator or const_iterator

Question

I\'m wondering, if there is a way to check at compile time whether a type T of some iterator type is a const_iterator, or not. Is there some difference in the types that ite

Answer 1

This is a bit hacky because you have to pass T itself but it works (template specialization, g++ 4.4.5):

template
struct is_const_iterator {
    enum {
        value = false
    };
};

template
struct is_const_iterator {
    enum {
        value = true
    };
};

Use like this:

typedef std::vector T;
is_const_iterator::value           //is false
is_const_iterator::value     //is true