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class Screen { // member list }; int main() { Screen mainScreen; }
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The class type Screen is declared in global scope, whereas the object mainScreen is declared in the local scope of main() An object of class type also has a lifetime Depending on whether the object is declared within a namespace scope or within a local scope, and depending on whether it is declared as static or not, the object may exist for the duration of the entire program or only for the duration of a particular function's invocation Objects of class type behave very much like other objects when considering their scope and lifetime The scope and lifetime of objects are introduced in 8 Objects of the same class type can be initialized and assigned to one another By default, copying a class object is equivalent to copying all of its data members For example:
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Screen bufScreen = myScreen; // bufScreen_height = myScreen_height // bufScreen_width = myScreen_width // bufScreen_cursor = myScreen_cursor // bufScreen_screen = myScreen_screen
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Pointers and references to class objects can also be declared A pointer to a class type can be initialized or assigned the address of a class object of the same class type Similarly, a reference to a class type can be initialized with the lvalue for an object of the same class type (Object-oriented programming extends this to permit a pointer or reference of a base class to refer to an object of a derived class):
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int main() { Screen myScreen, bufScreen[10]; Screen *ptr = new Screen; myScreen = *ptr; delete ptr; ptr = bufScreen; Screen &ref = *ptr; Screen &ref2 = bufScreen[6]; }
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By default, a class object is passed by value when specified as a function argument or as a function return value It is possible to declare a function parameter or a return type as a pointer or as a reference to a class type Section 73 presents parameters that are pointers or references to class types and explains when they should be used Section 74 presents return types that are pointers or references to class types and explains when they should be used The member access operators must be used to access either the data members or the member functions of a class object The dot member access operator () is used with a class object or reference; the arrow member access operator (->) is used with a pointer to a
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file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm (564 / 1065) [2001-3-29 11:32:09]
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#include "Screenh" bool isEqual( Screen& s1, Screen *s2 ) { // return false if not equal, true if equal if ( s1height() != s2->height() || s1width() != s2->width() ) return false; for ( int ix = 0; ix < s1height(); ++ix ) for ( int jy = 0; jy < s2->width(); ++jy ) if ( s1get( ix, jy ) != s2->get( ix, jy ) ) return false; return true; // still here equal }
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isEqual() is a nonmember function that compares two Screen objects for equality isEqual() has no access privilege to the private data members of Screen and hence cannot refer to the data members of s1 and s2 directly It must rely on the public member functions of the Screen class For isEqual() to obtain the value of the screen height and width, it must use the member functions height() and width(), referred to as access functions These functions provide read-only access to the private data members of the class Their implementation is straightforward:
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class Screen { public: int height() { return _height; } int width() { return _width; } // private: short _height, _width; // };
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Applying the arrow member access operator to a pointer to a class object is equivalent to applying the dereference operator (*) to the pointer to obtain the class object to which the pointer refers, and then applying the dot member access operator to access the desired class member For example, the expression
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