I’m trying to make a little physics engine and this is my function:

void handleCollisions(std::vector<Rigidbody>& rigidbodies, float collisionThreshold, float deltaTime) {
    // Iterate over all pairs of rigid bodies

    for (Rigidbody& bodyA : rigidbodies) {
        for (Rigidbody& bodyB : rigidbodies) {

            std::cout << bodyB.getPosition().y;
        }
    }
}

This function is called every frame. I’ve added an std::cout there. And it prints -510 at first then just prints “-nan(ind)”. The y position of the rigidbody is going down every frame to simulate gravity. It gives the correct number when i put the std::cout in the main loop like this though:

while (!glfwWindowShouldClose(window))
{
    rigidbody.update(deltaTime);
    boxRigidbody.update(deltaTime);
    std::cout << bodyA.getPosition().y;
    //this is where i call the handleCollisions function
}

I’ve tried replacing the for loops with this:

for (size_t i = 0; i < rigidbodies.size(); ++i) {
    for (size_t j = i + 1; j < rigidbodies.size(); ++j) {

but it just prints 10 even though the y position is going down every frame. How can I fix this?