c++ primer 6.2.6节练习答案

 1 int sum(initializer_list<int> num)
 2 {
 3     decltype(num.size()) num_sum = 0;
 4     for (const auto &elem : num)
 5         num_sum += elem;
 6     return num_sum;
 7 }
 8 
 9 int main()
10 {
11     int num1;
12     initializer_list<int> num{2,3,4};
13     
14     int n_sum = sum(num);
15     cout << n_sum << endl;
16     system("pause");
17     return 0;
18 }