C++17 STL Cookbook

How to do it...

In this section, we will use the two different ways to access an std::vector, and then see how we can utilize them to write safer programs without decreasing readability.

1. Let's include all the needed header files, and fill an example vector with 1000 times the value 123, so we have something we can access:

      #include <iostream>      #include <vector>            using namespace std;

            int main()      {          const size_t container_size {1000};          vector<int> v (container_size, 123);

2. Now, we access the vector out of bounds using the [] operator:

         cout << "Out of range element value: "               << v[container_size + 10] << '\n';

3. Next, we access it out of bounds using the at function:

          cout << "Out of range element value: "  << v.at(container_size + 10) ...