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Is it true that by base class pointer you can call only those functions of derived class which are inherited from the base class?
Yes, provided those functions are declared virtual. If they are not virtual, the base class method is implicitly called instead. The base class should be thought of as a common interface to the objects that derive from it, while the derived objects are "more specialised" forms of the base class, which can override the virtual base class methods to produce more specific behaviour. The less derived the object, the less specialised it becomes. Certain functions can be predicted for all derived objects, but cannot be implemented in the base class. For instance, all shapes can be drawn, but a shape base class cannot implement a Draw() function unless it knows what type of shape it actually is. But by deriving specific shapes such as circles and squares from the shape class, they can each provide their own implementations for the Draw() function, which can then be declared pure-virtual in the base class. This not only ensures that every derived shape provides its own Draw() method, but also ensures that no instances of shape can be created other than by derived objects. The shape then becomes abstract; so shape is a conceptual object while circles and squares are actual objects.
Does the derived class take the memory of base class in inheritance?
Yes, the derived class includes the memory of the base class. The derived class inherits everything in the base class, data and function, and provides additional data and function as needed.
What is the function of the base of the microscope?
The function of the base of the microscope is to provide support to the microscope. The base is important when one is using the microscope or carrying it.
What is the difference between inheritance and delegation?
When you inherit you typically override and specialise the virtual methods of the base class. With delegation, you embed a member object in your class and provide an interface (often a simplified interface) to that embedded object. Each embedded object takes care of itself, the container merely provides an interface and delegates the calls to the object itself.
What are component of DSS?
Components of a Decision Support System (DSS) typically include a database, model base, user interface, and decision-making tools. The database stores relevant data, the model base provides analytical tools, the user interface allows interaction with the system, and decision-making tools assist in making informed decisions based on data and analysis.
What do you mean by inheriting the interface?
In object oriented programming, a derived class inherits the protected and public members of its base class. Those members therefore define the interface that is inherited by the derived class. The derived class may augment that interface to provide a more specialised implementation of the interface, without the need to re-write the generic interface of the base class. The implication is that the derived class is a more specialised form of the base class.
What is meant by interface of a class and implementation of a class in c plus plus?
The interface of a class is defined as being the methods that allow the outside world to interact with objects instantiated from that particular class type. That interface may be declared within the class itself or it may be inherited from base classes, or it may be some combination of the two. The interface may also be virtual or even pure-virtual, either in whole or in part. The implementation determines how that interface operates. Although the interface and the implementation go hand-in-hand they are treated separately because a derived class can override the generic interface exposed by the base class in order to provide a more specialised implementation of the base class interface, as well as provide new interfaces of its own. The generic interface needn't be virtual in order to be overridden, but it must be virtual in order to allow polymorphic behaviour. Where the base class cannot provide an implementation because it is intentionally abstract and therefore relies solely upon a derived implementation, it will provide a pure-virtual interface that absolutely must be implemented by all derivatives. If a class declares or inherits a pure-virtual interface with no implementation, that class automatically becomes abstract. Only classes that provide a complete implementation for all pure-virtual interfaces (including any generic implementations inherited from base classes derived from the base class), can actually be instantiated. When calling a base class method from a non-member function, one would rightly expect the implementation of the derived class to be executed. In order to achieve this, the generic interface must be virtual and the virtual table ensures the call is routed to the correct implementation. Without this, only the base class method can be called, which may result in unexpected behaviour in the derived class since the base class would be unaware of its specific behaviour. While it is possible to allow a base class to gain access to a derived class interface without exposing a virtual interface, this can only be done when the base class already knows exactly what type of derivative to expect. Knowing the type of its derivative allows the base class to make an explicit dynamic cast of itself in order to call the appropriate interface. But it cannot predict the future: if you derive a new class of object that it knowns nothing about, it cannot gain access to its specialised interface. Even dynamic casting is impossible without knowing what type of object to cast to. Virtual interfaces overcome this problem by ensuring that no matter what derivatives are created either now or in the future, the base class can access each of their specific implementations through just one generic interface, without the need for any dynamic casting (which is almost always a sign of poor design). When a base class interface is routed to a derived class implementation, that specific implementation has complete access to the derived class' interface. Thus interfaces that the base class doesn't even know exist can be implemented via calls through the base class' virtual interface which is the only interface the base class really needs to know anything about. To put it another way, all derivatives of the same base class can be treated just as if they were the base class itself, with a common, generic interface, and yet each instance can exhibit entirely different behaviour, according to the specific implementations defined by each derivative. That is, one interface/multiple implementations. Derived class implementations may also, optionally, call any base class method and access any base class variable (other than the base class' private members, of course). This makes it possible to provide a generic implementation of the virtual interface that can then be augmented or replaced completely by the more specific implementations of the derived interface. Even pure-virtual methods, which are normally not implemented in an abstract base class, can provide a generic implementation where appropriate. Although the implementation cannot be inherited, the interface must be inherited because it is virtual. However, once a derived class implements a pure-virtual interface, that implementation can then be inherited by its derivatives, to be further specialised and or augmented as necessary.
What is function base in microscope?
The function base of a microscope refers to the lower part of the microscope that provides support and stability for the entire instrument. It typically houses the light source, electrical components, and controls for adjusting the focus and magnification of the microscope. A sturdy and well-designed base is essential for ensuring accurate and clear microscopic observations.
What type of organism provides the base of a food?
organism provides the base of a food web is grass
In exponential growth functions the base of the exponent must be greater than 1. How would the function change if the base of the exponent were 1 How would the function change if the base of the expon?
"The base of the exponent" doesn't make sense; base and exponent are two different parts of an exponential function. To be an exponential function, the variable must be in the exponent. Assuming the base is positive:* If the base is greater than 1, the function increases. * If the base is 1, you have a constant function. * If the base is less than 1, the function decreases.
What is the function of the base of a microscope?
The base of a microscope provides stability and support for the entire microscope system. It also houses the illumination source, such as a light bulb or a mirror, which is necessary to illuminate the sample being observed on the microscope stage.
What is a root for microscope?
Root for a microscope refers to the base or main structure that holds the lenses and other components in place. It provides stability and support for the microscope to function properly.
