Can we declare a constructor in private sector?

Answer 1

but then how it will be called??

Answer 2

@Lakshay thanks..

Answer 3

Yes you can.

Answer 4

what's Singleton pattern ??

Answer 5

someone plz explain how can we call a constructor declared privately & is there any use of doing so?
I'm not able to understand the link above posted by Chessmaster.
Do explain using simple terms...

Answer 6

This StackOverflow thread explains it all I hope:

https://stackoverflow.com/questions/4648602/private-constructor

Answer 7

When constructor & destructor are public, they are called automatically.
If we declare them as private we have to call them explicitly.
Here is program to use a privately declared constructor :
class X
{
private :
int a;
X(){
a = 11;
cout<<"\n This is contr";}
~X(){
cout<<"\n This is destr";}
public:
void func()
{
this->X::X(); //invoke constructor
cout<<"\n a = "<<a;
this->X::~X(); //invoke destructor
}
};
void main()
{
X*x; // x is a pointer to class X
x->func; // x invokes func
}
In this code func() which is public member of class invokes constructor and destructor from private section of class indirectly.
Output:
This is contr
a = 11
This is destr

Answer 8

Yes we can, but it would not be much useful then ...

Answer 9

yes we can declare a constructor in private but in some books and sites it is writen wrong that we can't write