asd.cc

#include <iostream>
#include <vector>
#include <map>
#include <string>
#include <thread>

int main(int argc, const char** argv)
{
  std::mutex value_mutex;
  std::vector<std::thread> threads;
  int value = 0;

  for (int i = 1; i <= 10000; ++i) {
    threads.push_back(std::thread([&value, &value_mutex] (const int i) {
      std::lock_guard<std::mutex> lg(value_mutex);
      value += i;
    }, i));
  }

  for (auto& t: threads) t.join();

  std::cout << value << std::endl;
  return 0;
}