// MT3-Q2.cpp

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

template<typename CallObj>
bool Executor(CallObj obj, size_t millisec, size_t numTries = 10)
{
  using namespace std::chrono_literals;

  size_t count = 0;
  bool retVal = false;
  while (true)
  {
    if (obj())
    {
      std::cout << "\n  operation succeeded\n";
      return true;
    }
    else
    {
      std::cout << "\n  retrying operation";
      if (++count >= numTries)
      {
        std::cout << "\n  operation failed after " << numTries << " retries\n";
        return false;
      }
      std::this_thread::sleep_for(std::chrono::microseconds(1000*millisec));
    }
  }
}

using CallType = std::function<bool()>;

int main()
{
  CallType ct = []() { return false; };
  Executor<CallType>(ct, 500, 5);

  ct = []() 
  { 
    static size_t count = 0; 
    if (++count > 2)
      return true;
    return false;
  };
  Executor<CallType>(ct, 500, 5);
}