how do i store and get a queue of structure?

Question

How do I store and get value of structure into a queue where I have 2 values? I wanna queue this few values.

| 4 , 2 |

| 3, 5 |

Where by 4,2 and 3,5 can be a variable such as

primaryQ.push(a, b);

My structure:

struct primarytemp{
    double process;
    double secondary;
};

Here's how I declared my main:

int main(){
    queue<primarytemp> primaryQ;
    primaryQ.push(4, 2);
}

Answer 1

您可以将一个primarytemp对象推入队列，而无需修改类型：

queue<primarytemp> q;

q.push(primarytemp{4., 2.});  // Requires current C++ standard (C++11)

primarytemp p = {3., 5.};
q.push(p);                    // Also  works pre-C++11

正如其他人所提到的，您可以向 中添加一个构造函数primarytemp，尽管这意味着它不再是一个聚合。这可能无关紧要。

primarytemp
{
  primarytemp() : process(), secondary() {}
  primarytemp(double process, double secondary) 
  : process(process), secondary(secondary) {}

  double process;
  double secondary; 
};

这让你可以说

q.push(primarytemp(4., 2.)); // Also works pre-C++11

要访问您刚刚推送的元素，请使用back()返回引用的方法：

std::cout << "process" << q.back().process() << std::endl;

您也可以复制该元素：

primarytemp = q.back();

该front()方法允许您对队列中的第一个元素执行相同的操作。

要删除前面的元素：

q.pop();