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When an object is created, a pointer to this table, called the virtual table pointer, vpointer or VPTR, is added as a hidden member of this object. As such, the compiler must also generate "hidden" code in the constructors of each class to initialize a new object's virtual table pointer to the address of its class's virtual method table.
In class-based, object-oriented programming, a constructor (abbreviation: ctor) is a special type of function called to create an object.It prepares the new object for use, often accepting arguments that the constructor uses to set required member variables.
For this reason, calling virtual functions in constructors is generally discouraged. In C++, the "base" function is called. Specifically, the most derived function that is not more derived than the current constructor or destructor's class is called. [7]: §15.7.3 [8] [9] If that function is a pure virtual function, then undefined behavior occurs.
Virtual inheritance is a C++ technique that ensures only one ... This example to illustrates a case where base class A has a constructor variable msg and an ...
The compiler generated functions will be public, non-virtual [3] and the copy constructor and assignment operators will receive const& parameters (and not be of the alternative legal forms). [ 4 ] Example
Objects are created by calling a special type of method in the class known as a constructor. Classes may inherit from other classes, so they are arranged in a hierarchy that represents "is-a-type-of" relationships. For example, class Employee might inherit from class Person.
This constructor is a special kind of constructor, called an initializer-list-constructor. Classes with such a constructor are treated specially during uniform initialization (see below ) The template class std::initializer_list<> is a first-class C++11 standard library type.
Virtual class; Virtual function (also called virtual method) Virtual function pointer (also called virtual method pointer) Virtual inheritance (Object Oriented Programming) Virtual method table (also called vtable, virtual function table or virtual method table) Viscosity (programming) Void type
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