Herb Sutters如何监控班级工作？ [英] How does Herb Sutters monitor class work?

问题描述

我试图理解Herb Sutter在C ++和Beyond 2012上提出的监视器类：

I am trying to understand the monitor class that Herb Sutter presented on C++ and Beyond 2012:

template<typename T>
class monitor {
private:
    mutable T t;
    mutable std::mutex m;

public:
    monitor(T t_ = T{}) : t{ t_ } {} 
    template<typename F>
    auto operator()(F f) const -> decltype(f(t))
    {
        std::lock_guard<std::mutex> _{ m }; return f(t);
    }
}; 

我设法创建了一个类，该类以更老式，更简单的方式进行相同的操作（对于至少是我）方式：

I have managed to create a class that does the same thing in a more old fashioned and simpler (for me at least) way:

template<typename T>
class MyMonitor {
public:
    MyMonitor() { t = T(); }

    template<typename F>
    auto callFunc(F f) {
        std::lock_guard<std::mutex> lock(m);
        return f(t);
    }

private:
    T          t;
    std::mutex m;
};  

在哪些方面Herb Sutters的编码比我的更好？

In which ways are Herb Sutters code better than mine?

推荐答案

在哪些方面Herb Sutters的代码比我的更好？

In which ways are Herb Sutters code better than mine?

• 您的 T 应该是默认可构造且可分配的。



• 在Herb Sutters代码中， T 应该是可复制构造的。

  • Your T should be default constructible, and assignable.

  • In Herb Sutters code, T should be copy constructible.

    Herb Sutters代码允许初始化成员。

    Herb Sutters code allows to initialize the member.

    您的操作符（）不处理引用。

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