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(*s2)height()
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Class Member Functions
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Class member functions implement the set of operations that can be performed on a class object The set of operations that can be performed on a Screen class object is defined by the member functions declared in our Screen class:
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class Screen { public: void home() { _cursor = 0; } void move( int, int ); char get() { return _screen[_cursor]; } char get( int, int ); bool checkRange( int, int ); int height() { return _height; } int width() { return _width; } // };
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Although each class object has its own copy of the class data members, there exists only one copy of each class member function For example:
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Screen myScreen, groupScreen; myScreenhome(); groupScreenhome();
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When the function home() is called for the object myScreen, the data member _cursor accessed within home() is the data member of the object myScreen When the function home() is called for the object groupScreen, the data member _cursor refers the object groupScreen's data member; however, the same member function home() is called How can the same member function refer to the data members of two different class objects This support is implemented through the this pointer, which is examined in the next section Inline versus Non-Inline Member Functions Notice that the definitions for the functions home(), get(), height(), and width() are provided within the class body These functions are said to be defined inline in the class definition These functions are handled automatically as inline functions Inline functions are introduced in Section 76 These member functions could also be declared inline in the class body by explicitly specifying the keyword inline before the return types of the member function definitions as follows:
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class Screen { public: // Using the inline keyword // to declare inline member functions inline void home() { _cursor = 0; } inline char get() { return _screen[_cursor]; } // };
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The definitions of home() and get() in this example have exactly the same meaning as the definitions of home() and get() in the previous example, in which the keyword inline was omitted Because it is redundant, our examples do not specify explicitly the keyword inline for member functions defined in their class body Member functions larger than one or two lines are best defined outside the class body This requires a special declaration syntax to identify the function as a member of its class: The name of the member function must be qualified by the name of its class For example, here is the definition of the function checkRange(), where the name of the function is qualified with Screen:::
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#include <iostream> #include "Screenh" // member function name is qualified with Screen:: bool Screen::checkRange( int row, int col ) { // validate coordinates if ( row < 1 || row > _height || col < 1 || col > _width ) { cerr "Screen coordinates ( " row ", " col " ) out of bounds\n"; return false; } return true; }
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A member function must be first declared inside the body of its class and the class body must be visible before a member function can be defined outside its class body For example, if the header Screenh were not included before the definition of the function checkRange(), the previous program would be in error The class body defines the complete list of class members This list cannot be expanded once the class body is complete Usually, a member function defined outside its class body is not an inline function However, such a function can be declared as an inline function either by using explicitly the inline keyword on the function declaration that appears in the class body, by using explicitly the inline keyword on the function definition that appears outside the class body, or both For example, the following implementation defines move() to be an inline member function of Screen:
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inline void Screen::move( int r, int c ) { // move _cursor to absolute position if ( checkRange( r, c ) ) // valid screen position { int row = (r-1) * _width; // row location _cursor = row + c - 1; } }
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The function get(int,int) can be declared inline by specifying the inline keyword as follows:
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class Screen {
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