C++可变参模板

1、用可变参模板实现打印多个值

// basic
template<typename T>
void print(T v)
{
    std::cout << v << std::endl;
}

// variadic Template
template<typename T,typename... Types>
void print(const T& first, const Types&... args)
{
    std::cout << first << ", ";
    print(args...);
}

测试

print(1, 2, 3, 4, 5);

测试结果

2、用可变参模板实现多个数相加

// basic
template<typename T>
T sumUp(const T& v)
{    
    std::cout << "In sumUp Base" << std::endl;
    return v; 
}

template<typename T,typename... Types>
T sumUp(const T& first, const Types&... args)
{
    std::cout << "In sumUp MAIn: count of arguments:" 
        << sizeof...(Types) << std::endl;
    return first + sumUp(args...);
}

测试

std::cout << sumUp(1, 2, 3, 4, 5,6, 7, 8, 9, 10) << std::endl;

测试结果