Type Definition pilka_dyn::ash::vk::PFN_vkAllocationFunction

type PFN_vkAllocationFunction = Option<unsafe extern "system" fn(*mut c_void, usize, usize, SystemAllocationScope) -> *mut c_void>;

https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/PFN_vkAllocationFunction.html