Function glfwGetX11Window 

pub unsafe extern "C" fn glfwGetX11Window(
    window: *mut GLFWwindow,
) -> usize

@brief Returns the Window of the specified window.

@return The Window of the specified window, or None if an error occurred.

@errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref GLFW_PLATFORM_UNAVAILABLE.

@thread_safety This function may be called from any thread. Access is not synchronized.

@since Added in version 3.0.

@ingroup native