C++ 11 可變模板參數的兩種展開方式

標籤：iostream   int   name   list   ++   ios   span   stdin   blog   

#include <iostream>#include <string>#include <stdint.h>template<typename T>T Sum(T t){    std::cout << t << " = ";    return t;}template<typename T, typename... Args>T Sum(T head, Args...args){    std::cout << head << " + ";    return head + Sum(args...);}template<typename T>void PrintArg(T t){    std::cout << t << " ";}template<typename... Args>void Expand(Args... args){    std::initializer_list<int32_t> {(PrintArg(args), 0)...};    std::cout << std::endl;}int32_t main(){    std::cout << Sum(1, 2, 3, 4) << std::endl;    Expand(1, 2, 3, 4);    std::cin.get();    return 0;}

效果:

1 + 2 + 3 + 4 = 101 2 3 4

 

C++ 11 可變模板參數的兩種展開方式