Как получить указатель на первый аргумент в функции типа void Fun(.){}?

/*! @brief Creates a Vulkan surface for the specified window.
 *
 *  This function creates a Vulkan surface for the specified window.
 *
 *  If the Vulkan loader or at least one minimally functional ICD were not found,
 *  this function returns `VK_ERROR_INITIALIZATION_FAILED` and generates a @ref
 *  GLFW_API_UNAVAILABLE error.  Call @ref glfwVulkanSupported to check whether
 *  Vulkan is at least minimally available.
 *
 *  If the required window surface creation instance extensions are not
 *  available or if the specified instance was not created with these extensions
 *  enabled, this function returns `VK_ERROR_EXTENSION_NOT_PRESENT` and
 *  generates a @ref GLFW_API_UNAVAILABLE error.  Call @ref
 *  glfwGetRequiredInstanceExtensions to check what instance extensions are
 *  required.
 *
 *  The window surface cannot be shared with another API so the window must
 *  have been created with the [client api hint](@ref GLFW_CLIENT_API_attrib)
 *  set to `GLFW_NO_API` otherwise it generates a @ref GLFW_INVALID_VALUE error
 *  and returns `VK_ERROR_NATIVE_WINDOW_IN_USE_KHR`.
 *
 *  The window surface must be destroyed before the specified Vulkan instance.
 *  It is the responsibility of the caller to destroy the window surface.  GLFW
 *  does not destroy it for you.  Call `vkDestroySurfaceKHR` to destroy the
 *  surface.
 *
 *  @param[in] instance The Vulkan instance to create the surface in.
 *  @param[in] window The window to create the surface for.
 *  @param[in] allocator The allocator to use, or `NULL` to use the default
 *  allocator.
 *  @param[out] surface Where to store the handle of the surface.  This is set
 *  to `VK_NULL_HANDLE` if an error occurred.
 *  @return `VK_SUCCESS` if successful, or a Vulkan error code if an
 *  [error](@ref error_handling) occurred.
 *
 *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED, @ref
 *  GLFW_API_UNAVAILABLE, @ref GLFW_PLATFORM_ERROR and @ref GLFW_INVALID_VALUE
 *
 *  @remark If an error occurs before the creation call is made, GLFW returns
 *  the Vulkan error code most appropriate for the error.  Appropriate use of
 *  @ref glfwVulkanSupported and @ref glfwGetRequiredInstanceExtensions should
 *  eliminate almost all occurrences of these errors.
 *
 *  @remark @macos This function currently only supports the
 *  `VK_MVK_macos_surface` extension from MoltenVK.
 *
 *  @remark @macos This function creates and sets a `CAMetalLayer` instance for
 *  the window content view, which is required for MoltenVK to function.
 *
 *  @thread_safety This function may be called from any thread.  For
 *  synchronization details of Vulkan objects, see the Vulkan specification.
 *
 *  @sa @ref vulkan_surface
 *  @sa @ref glfwGetRequiredInstanceExtensions
 *
 *  @since Added in version 3.2.
 *
 *  @ingroup vulkan
 */
GLFWAPI VkResult glfwCreateWindowSurface(VkInstance instance, GLFWwindow* window, const VkAllocationCallbacks* allocator, VkSurfaceKHR* surface);