c – 如何创建用列表初始化的构造函数？

举个例子：

#include <iostream>
#include <initializer_list>
#include <vector>

template<class T>
class X {
  long unsigned int size;
  std::vector<T> _elem;
public:
  X(std::initializer_list<T> l): size{l.size()} {
    for(auto x: l)
      _elem.push_BACk(X);
  }

  void print() {
    for(auto x: _elem)
      std::cout << x << " ";
  }
};

int main(int argc,char **argv) {
  X<int> x = {4,10,8,6};
  x.print();
  return 0;
}

有关std :: initializer_list的更多信息：
http://www.cplusplus.com/reference/initializer_list/initializer_list/