How to pass data to threads

threads.cpp

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

struct ImageProcessor {
    void process(std::string path) {
        std::cout << "image processed" << std::endl;
    }
};

class MyHelper {
public:
    MyHelper(std::string folderName): folderName(folderName) {}

    void operator()() {
        //read folder1
        std::vector<std::string> images;
        ImageProcessor processor;
        for (auto image : images) {
            processor.process(image);
        }
        //write back to where you want
        std::cout << "thread2 finished successfully" << std::endl;
    }
private:
    std::string folderName;
};

void someFunction() {
    //todo
}

int main() {
    someFunction(); //calling this function or object

    std::string folder1, folder2;

    std::thread thread1([folder1] {
        //read folder1
        std::vector<std::string> images;
        ImageProcessor processor;
        for (auto image : images) {
            processor.process(image);
        }
        //write back to where you want
        std::cout << "Thread1 finished successfully" << std::endl;
    });

    std::thread thread2{ MyHelper(folder1) };

    thread1.join();
    thread2.join();


    MyHelper myHelper(folder1);
    myHelper();

    std::thread thread3(myHelper);
    thread3.join();
    return 0;
}