CODEWITHSUNDEEP
c++stringiterator
Siddhant
Siddhant

Reputation: 113

Use String reverse iterator and iterator as same type of object (C++)

I am trying to use the same variable for both iterator and reverse iterator. However, I cannot find the common base class to do so. I want to do something like this:

string a;
....
string::iterator i;
if (....)
    i = a.begin();
else
    i = a.rbegin();  //Error
....

Is there a good way of doing this?

Upvotes: 2

Views: 693

Answers (1)

Caleth
Caleth

Reputation: 62636

There is no common type for std::string::iterator and std::string::reverse_iterator.

If you want to choose between them, you will need to have a different function for each type. The simplest way to do that is with a template

E.g.

template <typename Iterator>
void do_stuff(Iterator begin, Iterator end)
{
    ...
}

int main()
{
    string a;
    if (...)
        do_stuff(a.begin(), a.end());
    else
        do_stuff(a.rbegin(), a.rend());
    return 0;
}

Upvotes: 7

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