CODEWITHSUNDEEP
c++11stdvector
Sankar Balasubramanian
Sankar Balasubramanian

Reputation: 3

Why I am unable to assign an iterator with vector index values?

Sample code

std::vector<int> testvectr;
std::vector<int>::iterator it;
testvectr.push_back(10);
it = testvectr.begin(); // method 1 - works 
it = &(testvectr[0]); //  method 2  - errors as  binary '=': no operator found which takes a right-hand operand of type '_Ty *'

Why its throwing error? I am trying to assign a vector index. So later I can call it by *it. But I didn't understand the error behind it. Pls help.

Upvotes: 0

Views: 38

Answers (1)

Quentin
Quentin

Reputation: 63154

std::vector<T>::iterator is not necessarily T *. If you have a pointer p to an element of a vector and want to get an iterator to that same element, you can use the following pointer arithmetic:

auto it = v.begin() + (p - v.data());

Upvotes: 1

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