pub type PFN_vkCreateCommandPool = unsafe extern "system" fn(_device: Device, _create_info: *const CommandPoolCreateInfo, _allocator: *const AllocationCallbacks, _command_pool: *mut CommandPool) -> Result;pub type PFN_vkCreateCommandPool = unsafe extern "system" fn(_device: Device, _create_info: *const CommandPoolCreateInfo, _allocator: *const AllocationCallbacks, _command_pool: *mut CommandPool) -> Result;