const_cast.cpp

原创于 2007-11-08 12:49:00 发布 · 324 阅读

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#object #include #class #c

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本文通过一个C++程序示例展示了如何使用const关键字定义对象，并通过const_cast进行类型转换来修改原本不可更改的对象属性。这个例子有助于理解const限定符的作用及类型安全的重要性。

name="google_ads_frame" marginwidth="0" marginheight="0" src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-5572165936844014&dt=1194442938015&lmt=1194190197&format=336x280_as&output=html&correlator=1194442937843&url=file%3A%2F%2F%2FC%3A%2FDocuments%2520and%2520Settings%2Flhh1%2F%E6%A1%8C%E9%9D%A2%2FCLanguage.htm&color_bg=FFFFFF&color_text=000000&color_link=000000&color_url=FFFFFF&color_border=FFFFFF&ad_type=text&ga_vid=583001034.1194442938&ga_sid=1194442938&ga_hid=1942779085&flash=9&u_h=768&u_w=1024&u_ah=740&u_aw=1024&u_cd=32&u_tz=480&u_java=true" frameborder="0" width="336" scrolling="no" height="280" allowtransparency="allowtransparency"> #include <stdio.h>

class c {
public:
int j;
c(void) {j=10;}
};

void PrintInt(const c* Object)
{
  c* New = const_cast<c*> (Object);
   New->j +=5;
   printf("%d/n", New->j);
}

void main(void)
{
const c Sample;

PrintInt(&Sample);
}