中日韩在线视频,国产欧美日韩视频在线观看,久久久91精品

Constant Member Functions

Declaring a member function with the const keyword specifies that the function is a "read-only" function that does not modify the object for which it is called.

To declare a constant member function, place the const keyword after the closing parenthesis of the argument list. The const keyword is required in both the declaration and the definition. A constant member function cannot modify any data members or call any member functions that aren't constant.

// constant_member_function.cpp

class Date

{

public:

Date( int mn, int dy, int yr );

int getMonth() const; // A read-only function

void setMonth( int mn ); // A write function; can't be const

private:

int month;

};

int Date::getMonth() const

{

return month; // Doesn't modify anything

}

void Date::setMonth( int mn )

{

month = mn; // Modifies data member

}

int main()

{

Date MyDate( 7, 4, 1998 );

const Date BirthDate( 1, 18, 1953 );

MyDate.setMonth( 4 ); // Okay

BirthDate.getMonth(); // Okay

BirthDate.setMonth( 4 ); // C2662 Error

}

posted on 2008-07-17 17:36 aslucky 閱讀(276) 評(píng)論(0) 編輯收藏引用所屬分類: C++

只有注冊(cè)用戶登錄后才能發(fā)表評(píng)論。
【推薦】100%開源！大型工業(yè)跨平臺(tái)軟件C++源碼提供，建模，組態(tài)！

相關(guān)文章: Boost Study step1 介紹 Constant Member Functions

網(wǎng)站導(dǎo)航: 博客園 IT新聞 BlogJava 博問 Chat2DB 管理

導(dǎo)航

統(tǒng)計(jì)

隨筆 - 6
文章 - 2
評(píng)論 - 2
引用 - 0

常用鏈接

留言簿(1)

隨筆分類(6)

隨筆檔案(6)

文章分類(2)

C++(2) (rss)

文章檔案(2)

2008年7月 (2)

Open source library

POCO C++ Libraries
is a collection of open source C++ class libraries that simplify and accelerate the development of network-centric, portable applications in C++. Features threads, thread synchronization and advanced abstractions for multithreaded programming streams and filesystem access shared libraries and class loading powerful logging and error reporting security network programming (TCP/IP sockets, HTTP, FTP, SMTP, etc.) XML parsing (SAX2 and DOM) and generation configuration file and options handling database access Platforms & Portability POCO runs on a variety of platforms, including: Windows Mac OS X (embedded) Linux HP-UX Tru64 Solaris QNX

青青草原综合久久大伊人导航_色综合久久天天综合_日日噜噜夜夜狠狠久久丁香五月_热久久这里只有精品

aslucky

Constant Member Functions

導(dǎo)航

統(tǒng)計(jì)

常用鏈接

留言簿(1)

隨筆分類(6)

隨筆檔案(6)

文章分類(2)

文章檔案(2)

Open source library

Software often use

搜索

積分與排名

最新評(píng)論

閱讀排行榜

評(píng)論排行榜