C++与枚举

术语是“插入运算符”和“提取运算符”,用于插入和提取流中的数据。

下面是一个例子:

#include <iostream>
#include <sstream>

struct foo
{
    int x;
};

// insertion operator
std::ostream& operator<<(std::ostream& s, const foo& f)
{
    s << f.x; // insert a foo by inserting x
    return s;
}

// extraction operator
std::istream& operator>>(std::istream& s, foo& f)
{
    s >> f.x; // extract a foo by extracting x
    return s;
}

int main(void)
{
    std::stringstream ss;

    foo f1 = {5};
    ss << f1;

    foo f2;
    ss >> f2;
}

基于您的愿望:

MyFrameProducer producer;
MyFrameConsumer consumer;
Frame frame; // frame should probably be in the while loop, since its 
while(!producer.eof()) // lifetime doesn't need to exist outside the loop
{
    producer >> frame;
    consumer << frame;
} 

你可能会这样做:

struct MyFrameProducer {}; // add an eof function
struct MyFrameConsumer {};
struct Frame {};

// producer produces a frame
MyFrameProducer& operator>>(MyFrameProducer& p, Frame& f)
{
    /* whatever it takes to make a frame */

    return p;
}

// consumer consumes a frame
MyFrameConsumer& operator<<(MyFrameConsumer& c, const Frame& f)
{
    /* whatever it takes to use a frame */

    return c;
}

或者类似的东西。(对不起,我对这个问题的理解很小。)它 是 想要这个接口有点奇怪,因为它与流无关,您最好使用不同的接口(显式方法)。

看一看 this 生产商/消费者解决方案。虽然它是纯C的,但它非常优雅,所以我忍不住把它贴出来。