Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Why does't this work. faint.........about priority_queue

Posted on 2004-10-01
1
168 Views
Last Modified: 2013-11-20
I save a sample Struct

struct Packet
{
  unsigned int      l_Priority  : 5;       
  unsigned int      CRC        : 8;
 
  bool operator < (Packet* msg) const      
  {
        return l_Priority < msg->l_Priority ;
  }
  bool operator > (Packet* msg) const      
  {                   
        return l_Priority > msg->l_Priority ;
  }
};
in a priority_queue
 typedef std::priority_queue <const Packet*> Msg_Queue;
but it not works!!
I try to excute following test code
      Packet* p1;
      Packet* p2;

      p1 = new Packet();
      p2 = new Packet();

      p1->l_Priority = 1;
      p2->l_Priority = 3;

      if (p1 > p2)
            printf("p1 > p2\n");
      else
            printf("p1 < p2\n");
the result seems always p1 > p2, even though p1->l_Priority < p1->l_Priority
0
Comment
Question by:reneschy
1 Comment
 
LVL 55

Accepted Solution

by:
Jaime Olivares earned 20 total points
ID: 12205442
Try with this:

struct Packet
{
  unsigned int     l_Priority  : 5;      
  unsigned int     CRC      : 8;
 
  bool operator < (Packet& msg) const    
  {
       return l_Priority < msg.l_Priority ;
  }
  bool operator > (Packet& msg) const    
  {                
       return l_Priority > msg.l_Priority ;
  }
};

int main()
{
     Packet* p1;
     Packet* p2;

     p1 = new Packet();
     p2 = new Packet();

     p1->l_Priority = 1;
     p2->l_Priority = 3;

     if (*p1 > *p2)
          printf("p1 > p2\n");
     else
          printf("p1 < p2\n");
     system ("Pause");
     return 0;
 }    
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
MFC Dialog 9 51
iSeries FTP Exit Program 8 146
sameEnds challenge 3 180
Line meaning 9 87
Introduction: Displaying information on the statusbar.   Continuing from the third article about sudoku.   Open the project in visual studio. Status bar – let’s display the timestamp there.  We need to get the timestamp from the document s…
Introduction: The undo support, implementing a stack. Continuing from the eigth article about sudoku.   We need a mechanism to keep track of the digits entered so as to implement an undo mechanism.  This should be a ‘Last In First Out’ collec…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question