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发信人: Version (Who makes history and why), 信区: Program
标  题: const member function
发信站: 荔园晨风BBS站 (Wed Apr  9 21:52:13 2003), 站内信件

Constant Member Functions
C++ Specific
Declaring a member function with the const keyword specifies that the functi
on 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 clo
sing parenthesis of the argument list. The const keyword is required in both
the declaration and the definition. A constant member function cannot modif
y any data members or call any member functions that aren't constant.
END C++ Specific
Example
// Example of a constant member function
class Date
{
public:
   Date( int mn, int dy, int yr );
   int getMonth() const;       // A read-only function
   void setMonth( int mn );    // A write function;
                               //    cannot 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
}

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