What is the difference between std::thread and std::jthread?

Question

Accepted Answer

**std::thread:**
- Manual join/detach required
- No automatic cleanup
- Must call join() or detach()

```cpp
std::thread t([] { /* work */ });
t.join(); // must not forget!
```

**std::jthread (C++20):**
- Automatic join on destruction
- Cooperative cancellation via stop_token
- RAII compliant

```cpp
std::jthread t([](std::stop_token stoken) {
    while (!stoken.stop_requested()) {
        // work
    }
});
// Automatically joined and stop requested on destruction
```

**Use std::jthread** — it's safer and more convenient.

C++: What is the difference between std::thread and std::jthread?