编译错误：在此上下文中无法隐式捕获“this”

Question

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

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

看起来对于变量this-＆gt; ready，'this'不在正确的范围内。

在Java中，可以使用TestThread来处理这个问题。在C ++中有什么做同样的事情吗？

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 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";
        }

    }

Answer 1

您需要捕获this指针：

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