before:
class GameObject {
  float m_Pos[2];
  float m_Velocity[2];
  char m_Name[32];
  Model* m_Model;
  // ... other members ...
  float m_Foo;

  void UpdateFoo(float f)
  {
    floag mag = sqrtf(
      m_Velocity[0] * m_Velocity[0] +
      m_Velocity[1] * m_Velocity[1]);
      m_Foo += mag * f;
  }




after:
struct FooUpdateIn {
  float m_Velocity[2];
  float m_Foo;
};

struct FooUpdateOut {
  float m_Foo;
}

// update value depending on time passed and velocity
void UpdateFoos(const FooUpdateIn* in, size_t count, FooUpdateOut* out, float f) {
  for (size_t = 0; i < count; ++i) {
    float mag = sqrtf(
      in[i].m_Velocity[0] * in[i].m_Velocity[0] +
      in[i].m_Velocity[1] * in[i].m_Velocity[1]));
      out[i].m_Foo = in[i].m_Foo + mag * f;
  }
}