Sir in scope resolution can we define constructor outside the class?

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1.00/5 (3 votes)

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please reply me as soon as possible

What I have tried:

i have tried to define an constructor outside the class and it does not work sir tell me can it be possible to difine outside the class

Posted 10-Mar-16 17:32pm

Member 12384360

Updated 10-Mar-16 21:38pm

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dan!sh 10-Mar-16 23:48pm

No.

PIEBALDconsult 10-Mar-16 23:55pm

No, but maybe you want a Factory?

Member 12384360 10-Mar-16 23:56pm

now what is factory here?

Sergey Alexandrovich Kryukov 11-Mar-16 0:14am

See, for example, https://en.wikipedia.org/wiki/Factory_method_pattern...

Also, why writing something in the section "What I have tried" without showing what you have tried? What exactly have you written?

—SA

Sergey Alexandrovich Kryukov 11-Mar-16 0:13am

Before asking about possible or impossible, think at this: what would it possibly mean? The constructor creates an instance of a class. And why?
—SA

Member 12384360 11-Mar-16 0:20am

ohk i got it

«_Superman_» 11-Mar-16 3:12am

Please post what you have tried so far.

2 solutions

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KarstenK · Answer 1 · 2016-03-10T20:28:00

Solution 1

No and you shouldnt do it, because it destroyes the class pattern of encapsulation. If you need to modify a class object it should always made with member functions.

I think you must rethink your software design. Learn from this tutorials.

Posted 10-Mar-16 20:28pm

KarstenK

CPallini · Answer 2 · 2016-03-10T21:38:00

Solution 2

The contructor must be (by definition) a member of the class. However you can put its definition outside of the class (declaration must be inside the class one):

C++

// ctor.h header file
class A
{
public:
  A(); // just ctor declaration
};

and

C++

// ctor.cpp source file
#include <iostream>
#include "ctor.h"

// this is the ctor definition
A::A(){std::cout << "A()" << std::endl;}

int main()
{
  A a;
}

Posted 10-Mar-16 21:38pm

CPallini

v2

Comments

Member 12384360 11-Mar-16 6:41am

this code is showing an error
that there is no such directory as ctor

Member 12384360 11-Mar-16 6:44am

ok i now i understand that the difination nay be outside but declarationmust be inside