How do I initialize a const std::pair?

Question

Let's say that I've got a :

#include <utility>
using namespace std;
typedef pair<int, int> my_pair;

how do I initialize a const my_pair ?

Answer 1

使用它的构造函数：

const my_pair p( 1, 2 );

Answer 2

With C++11 you can also use one of the following:

const my_pair p = {2, 3};
const my_pair p({2, 3});
const my_pair p{2, 3};

Answer 3

const my_pair p = std::make_pair( 2, 3);

Answer 4

const my_pair p = my_pair（3,2）;