Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

[C/C++ Digestion] – Rule of Three, ¸´ÖÆ¿ØÖÆ


[C/C++ Digestion] – Rule of Three,
¸´ÖÆ¿ØÖÆ
×÷Õߣº
Jason Lee @
http://blog.csdn.net/jasonblog
ÈÕÆÚ£º
2010-04-13
 
[1]
¸´Öƹ¹Ô캯Êý
copy constructor
Rule of Three
ÊÇÖ¸ÀàÈç¹ûÐèÒªÎö¹¹º¯Êý£¬Ôòͨ³£Ò²ÐèÒª¸´Öƹ¹Ô캯ÊýºÍ¸³Öµ²Ù×÷·û¡£¶øÆäʵϰ¹ßµØÏÔʾ±àдÕâÈýÕß±¾¾ÍÊÇÒ»¸öÁ¼ºÃµÄϰ¹ß¡£ÒòΪÏà½ÏÓÚ±àÒëÆ÷×Ô¶¯Éú³ÉµÄ´úÂ룬ÏÔʾ±àд×Ô¼ºµÄ´úÂëÄÜÈóÌÐòÔ±¶ÔÕû¸ö³ÌÐòÓÐןüÇåÎúµÄÈÏʶºÍ°ÑÎÕ¡£
´ÓÐÎʽÉÏ˵£¬¸´Öƹ¹Ô캯Êý¾ßÓе¥¸ö±¾ÀàÐͶÔÏóÒýÓõÄÐβΣ¨Í¨³£ÓÃ
const
ÏÞ¶¨ÐÞÊΣ©£¬²¢ÇÒº¯ÊýÃûÓëÀàÃûÏàͬ£¬ÒòΪ¸´Öƹ¹Ô캯ÊýÒ²Êǹ¹Ô캯Êý¡£±ÈÈ磺
Demo(const Demo &demo){}

¸´Öƹ¹Ô캯Êý´ÓÐèÒªÉÏÀ´¿´ÓÐÁ½ÖÖÇé¿ö£¬Ò»ÊÇÓгÉÔ±ÔÚ¹¹Ô캯ÊýÖзÖÅä×ÊÔ´£¬±ÈÈçÖ¸Õë
ÊÇ×îµäÐ͵ÄÀý×Ó£»¶þÊÇÐèÒªÔÚ¸´Öƹý³Ì×öÌØ¶¨¹¤×÷¡£
´Ó×÷Óó¡ºÏÀ´Ì¸£¬±¾ÖÊÉÏ¿ÉÒÔ¿´×öÊÇÖÁÉÙ´æÔÚÁ½¸ö¶ÔÏóµÄÇé¿öÏÂÐèÒª¸´Öƹ¹Ô캯Êý£¬ÒòΪÐèҪʹÓÃÆäÒ»À´¶ÔÆäËü¶ÔÏó½øÐгõʼ»¯¡£±ÈÈ磺
1.
¸ù¾ÝͬÀàÐͶÔÏó³õʼ»¯Ä³Ò»¶ÔÏó£»ÎÒ¸öÈ˾õµÃÔÚÕâÖÖÇé¿öÏ£¬ºÜÈÝÒ×ÊèºöµÄÒ»¸öϸ½ÚÖ®´¦ÊÇ£ºÒ»°ã£¬¶Ô¹¹Ô캯Êý±È½ÏÉúÊèµÄ³ÌÐòԱϰ¹ßµØ¶¨ÒåÒ»¸öĬÈϹ¹Ô캯Êýºó£¬²¢ÇÒÔÚÀïÃæ½øÐÐÖ¸ÕëËùÐè¿Õ¼äµÄ¿ª±ÙºÍ·ÖÅ䣬¾Í»áDZÒâʶµØÒÔΪÒÔºóÿ¸ö¸ÃÀà¶ÔÏó³õʼ»¯Ê±¶¼»áºÏÀíµØÊ×ÏȶÔÖ¸Õë³ÉÔ±½øÐÐÄÚ´æ·ÖÅ䣬Ȼ¶øÈ´Ã»ÓÐ×ã¹»Éî¿ÌµØÒâʶµ½Èç¹ûµ÷ÓÃÁ˸´Öƹ¹Ô캯Êý£¬Ôò²»»áµ÷ÓÃĬÈϺ¯Êý£º
#include <iostream>
using namespace std;
class Demo {
public:
Demo(){ p = new int(1); }
Demo(const Demo &demo){ *p = *demo.p; }//Ö¸Õëp²¢Î´±»·ÖÅä¿Õ¼ä
~Demo(){}
void setP(int v){ *p = v; }
void show(){ cout << *p << endl; }
private:
int *p;
};
int main(){//³ÌÐòÔËÐÐʱ³ö´í
Demo d1;
d1.setP(3);
Demo d2 = d1;//Ö»µ÷Óø´Öƹ¹Ô캯Êý£¬²¢Ã»Óе÷ÓÃĬÈϹ¹Ô캯Êý£¬ËùÒÔÖ¸ÕëδӵÓпռä
return 0;
}

2.
½«¶ÔÏó×÷ΪÆÕͨʵ²Î£»ÕâÖÖÇé¿ö×îÈÝÒ×ÓëÖµ´«µÝµÄÇé¿ö½øÐÐÁªÏ룺´«µÝµÄÊÇÓë±äÁ¿µÈÖµµÄÒ»¸öÁÙʱֵ£¬¶ø·Çͬһ¸ö±äÁ¿¡£Í¬ÑùµÄ£¬ÒÔ¶ÔÏó×÷ΪÆÕͨʵ²Î£¬Ò²ÐèÒª½¨Á¢Ò»¸öÁÙʱ¶ÔÏ󣬾ÍÐèÒªµ÷Óõ½¸´Öƹ¹Ô캯Êý¡£±ÈÈçÒÔÏÂÒ»¶ÎºÁÎÞÒâÒåµÄ´úÂ룺
3.
´Óº¯ÊýÖзµ»ØÒ»¸öÆÕͨ¶ÔÏó£»ÕâÖÖÇé¿öµÄµÀÀíÓëÉÏÒ»ÖÖÇé¿öÒ»Ñù£¬Á½ÖÖÇé¿ö¿ÉÒÔ³öÏÖÔÚÒ»¶Î´úÂëÖУº
Demo Test(Demo demo){
Demo temp;
return temp;
}

4.
Ïȵ÷Óù¹Ô캯Êý´´½¨Ò»¸öÁÙʱ¶ÔÏó£¬ÔÙµ÷Óø


Ïà¹ØÎĵµ£º

³¹µ×¸ã¶¨CÖ¸Õë

 
תÌû×Ôhttp://teren.itpub.net/post/15914/189516дµÄ·Ç³£ºÃ£¬Í¬Ê±¶Ô×÷Õß´òÆÆÉ°¹øÎʵ½µ×µÄ¾«Éñ³¹µ×ÕÛ·þ
¡¶³¹µ×¸ã¶¨CÖ¸Õë¡·µÚһƪ ±äÁ¿µÄÄÚ´æÊµÖÊ
ÒªÀí½âCÖ¸Õ룬ÎÒÈÏΪһ¶¨ÒªÀí½âCÖГ±äÁ¿”µÄ´æ´¢ÊµÖÊ£¬ËùÒÔÎҾʹӓ±äÁ¿”Õâ¸ö¶«Î÷¿ªÊ¼½²Æð°É£¡
ÏÈÀ´Àí½âÀí½âÄÚ´æ¿Õ¼ä°É£¡Çë¿´ÏÂͼ£º
ÄÚ´æµØ ......

ÓÃC socket http·¢ËÍÕâ¶ÎÇëÇó±¨ÎÄ

HTTP·ÖΪÇëÇóÐУ¬ÇëÇóÍ·²¿ÒÔ¼°ÇëÇóÄÚÈÝ
ÄǸö³¤¶ÈÊý×ÖÖµ¾ÍÊÇÇëÇóÄÚÈݵij¤¶È£¨×Ö½ÚΪµ¥Î»£©
¸øÒ»¶ÎÀý×ÓÄã¾Í»ù±¾Ã÷°×ÁË:
onst CString getString(int i)
{
    CString s;
    s.Format(_T("%d"), i);
    return s;
}
////////////////////////////////
CS ......

Linux»·¾³ÏÂÓÃcÓïÑÔдµÄ²¥·ÅwavÎļþµÄС³ÌÐò

#include <unistd.h>
#include <fcntl.h>
#include
<sys/types.h>
#include <sys/ioctl.h>
#include
<stdlib.h>
#include <stdio.h>
#include
<linux/soundcard.h>
/* ÏÂÃæµÄÈý¸ö²ÎÊýÊǸú¾ßÌåÎļþÏà¹ØµÄ£¬ÎļþʲôÑù£¬¾ÍÒªÉèÖóÉʲôÑù */
#define RATE 11025&nbs ......

ʹÓÃc#´´½¨sql serverµÄ´æ´¢¹ý³Ì_c#Ó¦ÓÃ2

{
SqlConnection cnn = new SqlConnection
("context connection=true");
cnn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = cnn;
cmd.CommandText = "select * from customers";
SqlDataReader reader = cmd.ExecuteReader();
SqlContext.Pipe.Send(reader);
reader.Close();
cnn.Close();
}
......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ