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move( &myScreen, 2, 2 )
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The programmer can refer to the this pointer explicitly in a member function definition For example, it is legal although unnecessary to define the member function home() as follows:
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inline void Screen::home() { this->_cursor = 0; }
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There are circumstances, however, when the programmer does need to refer to the this pointer explicitly, as we saw with the Screen member function copy() defined earlier The next subsection presents some examples When to Use the this Pointer Our function main() calls the member functions of the class Screen on the objects myScreen and bufScreen such that each action is in a separate statement We can define the Screen class member functions to allow the concatenation of member function calls when they apply to the same Screen object For example, the calls in the function main() could be rewritten as
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int main() { // myScreenclear()move(2,2)set('*')display(); bufScreenreSize(5,5)display(); }
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This seems to follow the instinctive way of manipulating Screen objects, where a sequence of actions is used: Clear the Screen object myScreen, move its cursor to the location (2,2), set this location to the character " * ", then display the result The member access operators dot and arrow are left-associative operators When a sequence of these operators is found, the order of execution is left to right For example, myScreenclear() is invoked first, followed by the call to myScreen move(), and so on For myScreenmove() to be invoked following the call to myScreenclear(), clear() must return the class object myScreen The definition of the member function clear() must return the class object for which it is invoked As we have seen, access to the class object within a class member function is through the this pointer Here is the implementation for clear():
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// the declaration for clear() is in the class body // it specifies a default argument for bkground = '#' Screen& Screen::clear( char bkground ) { // reset the cursor and clear the screen _cursor = 0; _screenassign( // assign the string _screensize(), // with size() characters bkground // of value bkground ); // return the object for which the function was invoked return *this; }
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Notice that the return type of the member function is Screen&, which indicates that the member function returns a reference to an object of its own class type To allow the concatenation of the Screen member functions within main(), the member functions move() and set() need to be revised Their return type must be changed from void to Screen& and they must return *this from within their definitions
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Similarly, the Screen member function display() might be implemented as follows:
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Screen& Screen::display() { typedef string::size_type idx_type; for ( idx_type ix = 0; ix < _height; ++ix ) { // for each row idx_type offset = _width * ix; // row position for ( idx_type iy = 0; iy < _width; ++iy ) // for each column, write element cout _screen[ offset + iy ]; cout endl; } return *this; }
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The Screen member function reSize() might be implemented as follows:
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// the declaration for reSize() is in the class body // it specifies a default argument for bkground = '#' Screen& Screen::reSize( int h, int w, char bkground ) { // resize a screen to height h and width w // remember the content of the screen string local(_screen); // replaces the string to which _screen refers _screenassign( // assign the string h * w, // with h * w characters bkground // of value bkground ); typedef string::size_type idx_type; idx_type local_pos = 0; // copy content of old screen into the new one for ( idx_type ix = 0; ix < _height; ++ix ) { // for each row idx_type offset = w * ix; // row position for ( idx_type iy = 0; iy < _width; ++iy ) // for each column, assign the old value _screen[ offset + iy ] = local[ local_pos++ ]; } _height = h; _width = w; // _cursor remains unchanged return *this; }
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Not all uses of the this pointer in member function definitions are to return the object to which the member function is applied When we introduced the copy() member function in Section 133, we saw another use for the this pointer:
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void Screen::copy( const Screen& sobj )
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