C++ Boost Asio 池线程与 lambda 函数和传递引用变量

Question

我有一个 lambda 函数，我想 post 到一个提升池。 lambda 函数使用通过引用传递的大对象。但是，我似乎无法正确编写此代码运行。

#include <boost/asio.hpp>
#include <iostream>

int main() {
    int large_object = 10;
    auto f1 = [&large_object](int x) {
        std::cout << "this is a very large object that needs passed by ref " << large_object << std::endl;
        std::cout << x << std::endl;
        std::this_thread::sleep_for(std::chrono::seconds {3});
        std::cout << "DONE SLEEPING!" << std::endl;
    };

    int processor_count = 2;  // consider that this CPU has two processors

    // Launch the pool with n threads.
    boost::asio::thread_pool pool(processor_count);

    int x = 2;
    // Submit a function to the pool.
    boost::asio::post(pool, [x]{f1(x);});

    pool.join();

    return 0;
}

是否可以post将此 lambda 函数添加到增强池中？

感谢您的宝贵时间。

Answer 1

您也需要捕获 f1，就像其他变量一样。 Lambda 是一个变量：

 [x, f1]{f1(x);});

（或引用）

顺便说一句，如果你想要简单的线程池执行，也可以考虑std::async。

C++ Boost Asio 池线程与 lambda 函数和传递引用变量

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