# TaskGroup::WaitFor

```cpp
bool WaitFor(std::chrono::milliseconds timeout)
```

等待任务组中所有任务完成，可在超时后返回。

**参数：**
- `timeout` - 最大等待时间

**返回：** `bool` - 所有任务在超时前完成返回 true，超时返回 false

**复杂度：** O(n)

**示例：**

```cpp
TaskGroup* group = TaskSystem::Get().CreateTaskGroup();

for (int i = 0; i < 5; ++i) {
    group->AddTask([i]() {
        Thread::Sleep(i * 100);
        printf("Task %d done\n", i);
    });
}

if (group->WaitFor(std::chrono::seconds(1))) {
    printf("All tasks completed within 1 second\n");
} else {
    printf("Timeout! Some tasks still running\n");
    printf("Progress: %.1f%%\n", group->GetProgress() * 100.0f);
}
```

## 相关文档

- [TaskGroup 总览](task-group.md) - 返回类总览
- [Wait](wait.md) - 无超时等待