如何优雅的初始化 vector

std::vector<int> ints;

ints.push_back(10);
ints.push_back(20);
ints.push_back(30);

static const int arr[] = {16,2,77,29};
vector<int> vec (arr, arr + sizeof(arr) / sizeof(arr[0]));

std::vector<int> v = {1, 2, 3, 4};