a surprising value about lambda and cin.get

environment: vs2013 rc5 / vs2017；
project: win32 console application；

representation：compile and run a little while，then interrupt and watch variable "task_";
if "add_task(&Test::print, &t, str, 10)" in man, the "task_" is correct value： correct

  but if "add_task(&Test::print, &t, str, 10)" in mytest, the "task_" is wrong value; and if replace std::cin.get() with while(1){}, it turns right：
  [wrong][2]

---

#include <iostream>
#include <string>
#include <chrono>
#include <thread>
#include <functional>

using task_t = std::function<void()>;

class Test
{
public:
    void print(const std::string& str, int i)
    {
    std::cout << "Test: " << str << ", i: " << i << std::endl;
    }
};

template<typename Function, typename Self, typename... Args>
void add_task(const Function& func, Self* self, Args... args)
{
    task_t task = [&func, &self, args...]{ return (*self.*func)(args...); };    
    task_ = task;
}

Test t;
std::string str = "Hello world";

task_t task_ = nullptr;

void mytest()
{
    add_task(&Test::print, &t, str, 10);
}

int main()
{
    mytest();
    std::cin.get();
    return 0;
}