I have this simple test code that creates a vector of 2 elements and prints it’s size, then prints first element:

#include <vector>
#include <iostream>

using namespace std;

int main() {
    vector<double> arr {0, 0.1};
    cout << arr.size() << endl;
    cout << arr[0] << endl;
}

The code compiles and runs fine and outputs 2 then 0 as it should.

However when I run cppcheck on this file it reports this:

error: Out of bounds access in expression 'arr[0]' because 'arr' is empty. [containerOutOfBounds]
 cout << arr[0] << endl;
            ^

But arr is clearly not empty!

Is this a false positive or am I missing something?

Cppcheck version 2.12