c++ - 编译错误 : 'this' cannot be implicitly captured in this context

Question

我正在尝试添加一个条件变量来处理线程，但在这一行出现编译错误:

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

看起来变量 this-> 准备好了，'this' 不在正确的范围内。

在 Java 中，这可以用 TestThread.this 处理，C++ 中是否有任何东西可以做同样的事情？

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";
        }

    }

Answer 1

您需要捕获this 指针:

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