How to use it->empty() in an iterator-CodePudding

I want to use an iterator as a condition of a for loop, but when I define it, it->empty() always reports an error. I don’t know where the error is. When I change it to (*it).empty() It will also report an error later

The error is: the expression must contain a pointer type to the class, but it has type "char *"

#include <iostream>
#include <vector>
using namespace std;
int main ()
{
    string s("some string");
    for (auto it = s.begin(); it != s.end() && !it->empty(); it  )
    {
        cout<< *it <<endl;
    }
    
}

CodePudding user response：

The problem is that you are trying to access a member function called empty through a non-class type object(a char type object in this case). You can change your code to look like below:

#include <iostream>
#include <vector>
using namespace std;
int main ()
{
    
    std::vector<std::string> vec = {"some", "string", "is", "this"};
    for (auto it = vec.begin(); it != vec.end() && !it->empty(); it  )
    {
        cout<< *it <<endl;
    }
    
}

The above code works because this time we are using/calling the member function empty through a class type object(a std::string object in this modified example).

Also if you only wanted to know why you're having this error then i think the comments and my answer, answer that. If you have any other/further question then you can edit your question to add that.