Function gmp_mpfr_sys::mpfr::__gmp_set_memory_functions

pub unsafe extern fn __gmp_set_memory_functions(arg1: Option<extern fn(arg1: size_t) -> *mut c_void>,
                                                arg2: Option<unsafe extern fn(arg1: *mut c_void, arg2: size_t, arg3: size_t) -> *mut c_void>,
                                                arg3: Option<unsafe extern fn(arg1: *mut c_void, arg2: size_t)>)