编译错误：在此上下文中无法隐式捕获'this'

我正试图添加一个condition_variable来处理线程，但在这一行遇到了编译错误：

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

对于变量this->ready，this似乎不在正确的范围内。

在Java中，这可以用TestThread.this来处理，C++中有什么可以做同样的事情吗？

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 datan";
        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 completedn";
        }
    
    }