我试图添加一个condition_variable来处理线程，但是在这一行得到一个编译错误：

this->cv.wait(lk, []{return this->ready;});

看起来变量this->ready的“this”不在正确的范围内。
在Java中，这可以用TestThread.this来处理，在C++中有没有做同样的事情？

void TestThread::Thread_Activity()
    {
        std::cout << "Thread started \n";
        // Wait until ThreadA() sends data
        {
            std::unique_lock<std::mutex> lk(m);
            this->cv.wait(lk, []{return ready;});
        }
    
        std::cout << "Thread is processing data\n";
        data += " after processing";
        // Send data back to ThreadA through the condition variable
        {
           // std::lock_guard<std::mutex> lk(m);
            processed = true;
           // std::cout << "Thread B signals data processing completed\n";
        }
    
    }