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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(279) 評(píng)論(0) 編輯收藏引用所屬分類(lèi): C++

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

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