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Answered 2012-04-07 21:33:42

You overload a constructor by declaring two or more constructors in a class, each with different signatures.

When no constructor is specified, a default constructor and a copy constructor are implied. Both can be overridden. The default constructor can also be overloaded if all arguments are given default values in the declaration.

You can add as many construction overloads as required in order to initialise your class. If your class has many members to initialise, it may be helpful to use a structure and an overloaded constructor to accept the structure.

For every constructor that has exactly one argument, there should also be an equivalent assignment operator overload. The copy constructor assignment overload is implied if not specified.


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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).

What are the disadvantages of operator overloading in c plus plus?

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.

The constructor is a method that runs to initialize the instance of the class. It runs right after memory allocation. The destructor is a method that runs to deinitialize the instance of the class. If runs right before memory deallocation.

Overloading a method means to provide the same method name with different signatures, to cater for all the different parameter types that may be passed to a method. Overriding means to provide a new implementation of an existing method, inherited from a base class. Overloaded methods can also be overridden.

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

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.

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.

Constructor creates an instance of class, destructor destroys it.

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.

Overriding means to provide a new implementation for an existing method. The existing method must be inherited from a base class. Overloading means to provide the same method name, but with a different signature, to cater for the different parameter types the method can accept. Overloaded methods inherited from a base class can also be overridden in a derived class.

A destructor in C++ is a method of a class that runs when the class is deleted. It performs cleanup of the members of the class that need cleanup, such as deallocation of subobjects referred to by pointers in the class, subobjects which were earlier allocated by a constructor or other method of the class.

class complex { private: double real; double imaginary; public: complex() {...} // constructor, etc. operator+(const& complex a) { // operator plus this->real += a.real; this->imaginary += a.imaginary; } }

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.

Function overloading is a C++ thing, not a C thing.

There is no operator overloading in C. This is only a C++ thing.

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.

Yes, but you need a copy constructor or an assignment operator method. And you can only do this in C++, not in C.

Operator overloadingThe mechanism of giving special meanings to an operator is known as operator overloading.It provides a flexible option for the creation of new definitions for most of the C++ operators. we can almost create a new language of our own by the creative use of the function and operator overloading techniques.

It is a non-existent term. Objects cannot be overloaded. Only functions can be overloaded.

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.

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