我需要在 Swift 中 memset 一个 C 结构吗？

Question

AFAIK, In swift, calling the default initialiser of classes/structs will initialise everything to 0 , nil . In C (socket programming for example) sometimes memset is used to set everything to 0 before using the struct. Do I need to use memset in swift too or is fine the way I wrote it?

(BTW, In this case memset is used because hints should be set to 0 except below 2 parameters. Non 0 (garbage, etc) will have side effects on res when calling getaddrinfo .

C:

struct addrinfo hints, *res;
int status;

memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;

status = getaddrinfo(NULL, MYPORT, &hints, &res);

Swift:

var res = UnsafeMutablePointer<addrinfo>()
var hints = addrinfo()
hints.ai_family = AF_UNSPEC
hints.ai_socktype = SOCK_STREAM

let status = getaddrinfo(nil, MYPORT, &hints, &res)

Answer 1

From the Xcode 6.3 release notes :

Imported C structs now have a default initializer in Swift that initializes all of the struct's fields to zero.

which means that

var hints = addrinfo()

initializes all fields of struct addrinfo to zero and there is no need to call memset() .