Function glfwSetWindowPosCallback 

pub unsafe extern "C" fn glfwSetWindowPosCallback(
    window: *mut GLFWwindow,
    callback: Option<unsafe extern "C" fn(*mut GLFWwindow, i32, i32)>,
) -> Option<unsafe extern "C" fn(*mut GLFWwindow, i32, i32)>

@brief Sets the position callback for the specified window.

This function sets the position callback of the specified window, which is called when the window is moved. The callback is provided with the position, in screen coordinates, of the upper-left corner of the content area of the window.

@param[in] window The window whose callback to set. @param[in] callback The new callback, or NULL to remove the currently set callback. @return The previously set callback, or NULL if no callback was set or the library had not been [initialized](@ref intro_init).

@callback_signature @code void function_name(GLFWwindow* window, int xpos, int ypos) @endcode For more information about the callback parameters, see the [function pointer type](@ref GLFWwindowposfun).

@errors Possible errors include @ref GLFW_NOT_INITIALIZED.

@remark @wayland This callback will never be called, as there is no way for an application to know its global position.

@thread_safety This function must only be called from the main thread.

@sa @ref window_pos

@since Added in version 3.0.

@ingroup window