std::vector < bidule > v;
for (std::vector < bidule > ::reverse_iterator itr = v.rbegin(); itr != v.rend(); ++itr)
for (std::vector < bidule > ::iterator it = v.begin(); it != v.end(); it++)
for ( size_t i = 0; i < v.size(); ++i )
bool focus = glfwGetWindowParam(GLFW_ACTIVE);