unknown number of threads cpp

To create an unknown number of threads in C++, you can follow these steps:

1. Include the necessary header files: To work with threads in C++, you need to include the <thread> header file.

2. Create a function or lambda expression: Write the code for the task that you want each thread to perform. This can be a function or a lambda expression.

3. Create an instance of std::thread: Declare a variable of type std::thread to represent each thread. You can use a container, such as a vector, to store these thread objects.

4. Start the threads: Call the std::thread constructor to create a new thread, passing the function or lambda expression as an argument. Add the newly created thread object to the container.

5. Join the threads: After creating and starting all the threads, use the std::thread::join() function to wait for each thread to finish executing. This ensures that the main thread does not terminate before the other threads complete their tasks.

6. Clean up: Once all threads have finished executing, you can optionally clean up by destroying the thread objects or reusing them for other tasks.

It's important to note that the above steps outline a general approach to creating an unknown number of threads in C++. The specific implementation may vary depending on your requirements and the structure of your program.