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What is dynamic constructor in c plus plus?

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Answered 2012-09-15 06:24:07

This constructor is used to allocate the memory to the objects at the run time..

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An implicit constructor call will always call the default constructor, whereas explicit constructor calls allow to chose the best constructor and passing of arguments into the constructor.

Constructor creates an instance of class, destructor destroys it.

There is no specific keyword for a constructor in C++. Simply define and declare a method of the class with the same name as the class and it will be a constructor. A constructor with no arguments is the default constructor, a constructor with one argument of class type is the copy constructor, and a constructor with one argument of some other type is the conversion constructor. You can provide other overloaded constructors if you want.

That depends on how you define body of class. If you do not define constructors then compiler will provide default constructor and it is not overloaded. If you create your own constructor you automatically overload default constructor.

Default, Copy, Conversion, Implied (a case of default).

A constructor creates the initial state of a collection of data. A function modifies or queries the data after it has been initialized.

Yes, you can use, and often you should, use more than one constructor in a class in C++. Normally, there is a default constructor, a copy constructor, and one or more conversion constructors. Sometimes, there are also other constructors, overloaded based on argument signature, if there are complex situations.

C++ allows both static and dynamic binding. Static binding occurs at compile time. Dynamic binding occurs at runtime.

dynamic constructor is a way to constructing an object based on the run type of some existing object. it basically uses standard virtual functions/polymorphism

what is the difference between message passing and dynamic binding

A default constructor is a constructor that takes no arguments.Here's a sample:class c{int a,b;c() //Constructor 1{a=2;b=1;}c(int x, int y) //Constructor 2{a=x;b=y;}};Here, Constructor 1 is called the default constructor, while Constructor 2 is a parameterized constructor.

Static binding occurs at compile time. Dynamic binding occurs at runtime.

No. Constructors initialise objects and, by definition, must be able to modify the member variables. Uninitialised members are a disaster waiting to happen even without a constructor declared const! Thankfully, the compiler won't permit a const constructor.

Constructor overloading, just like any function's overloading, is where more than one configuration of parameters exists for the function. Based on the number and type of the parameters, different versions of the function can be resolved by the linker. This is typically used in the constructor as the default constructor (no parameters), the copy constructor (one reference parameter of the same type as the class), and the conversion constructor (any other combination of parameters).

Compared with what? There are no merits or demerits. Construction is the only way to initialise an instance of a class.

By dynamic constructor I assume you mean the C++ new operator. It works by calling malloc to allocate a contiguous block of memory for the specified class, returning a pointer to that memory, or NULL if the allocation fails. The amount of memory allocated is the sum of all member variables, plus padding where required. If the class is a derived class, the contiguous block of memory will be large enough to accommodate all the base class member variables as well, and the least-derived class constructor is called first to initialise those variables, working down the hierarchy to the most-derived class constructor. When the pointer is deleted, the most-derived class destructor is called first, working back up the hierarchy (providing the least-derived class destructor is declared virtual).

In C++, overriding and function, method, or operator is a different thing than (dynamic) polymorphism, so overriding a polymorphic method is almost entirely possible.

A constructor is a method that fires when the object is instantiated. A friend function is a function that has special access to the object. They are two different types of things, and cannot be further differenced.

There is no such thing as a constructor function in C++ (constructors have no return value, not even void, and cannot be called like regular functions). Constructors are invoked rather than called directly, either by declaring a static variable of the class type, or via the C++ new operator.

In a class, the Destructor is like the opposite of the Constructor. The Constructor is run when an object of the class is created (usually to set up the variables as needed), and the Destructor is run when it is destroyed (usually to clean up or delete variables).

It cannot. Inheritance is a compile-time operation. Constructors are invoked at runtime at the point of instantiation.

Casting is the conversion of one type to another type, better known as a type cast. A class constructor that accepts one argument is a conversion constructor because it converts its argument to an object of the class. However, if the argument is of the same type as the class then it is known as a copy constructor.

Whenever a new object is instantiated, the appropriate class constructor for that object is invoked automatically. At compile time, argument-dependent lookup is used to determined which specific constructor to invoke. When passing objects to functions by value, the class copy constructor is invoked. If there is no copy constructor for the class, objects of this class cannot be passed by value. When returning objects from functions by value, the class move constructor is invoked. If there is no move constructor for the class, the class copy constructor is invoked instead. If neither exists, objects of this class cannot be returned by value.

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