Check this code: the thing i couldn't understand is when the object is being
returned neither the copy constructor is being called nor the assignment
operator overload is called....then how the object is being copied into b. i
don't think default copy constructor should be called if i have made our own
copy constructor....???
#include<iostream>
using namespace std;
#include<conio.h>
class X
{
public:
int num;
X(int a)
{
num=a;
cout<<"\n constructor";
}
X(const X& t)
{
this->num=t.num;
cout<<"\nCopy ";
}
X operator=(const X& t)
{
this->num =t.num;
cout<<"\n Assigment ";
return t;
}
X fun()
{
cout<<"\nin fun";
return X(7);
}
~X()
{
cout<<"\ndestruct ";
}
};
int main()
{
{
X a(1);
X b=a.fun();
cout<<"\n\n"<<b.num;
}
getch();
}
On Sun, Aug 21, 2011 at 12:33 PM, Abhishek Yadav <[email protected]
> wrote:
> The code is correct..return X will make a temporary object and for that a
> constructor and corresponding destructor will be called and that object is
> returned.
>
> On Sun, Aug 21, 2011 at 12:24 PM, Puneet Chawla <[email protected]
> > wrote:
>
>> It will show error
>>
>> On Sun, Aug 21, 2011 at 12:21 PM, Sanjay Rajpal <[email protected]> wrote:
>>
>>> I think it will not be an error.
>>>
>>> This is because X() will create a temporary object, and when the
>>> object is returned in the function calling it, then default copy
>>> constructor will do bitwise copy of data members in the calling
>>> function.
>>>
>>> Correct me if m wrong.
>>>
>>> On 8/20/11, sachin sabbarwal <[email protected]> wrote:
>>> > class X()
>>> > {
>>> >
>>> > X()
>>> > {
>>> > }
>>> >
>>> >
>>> >
>>> > X fun()
>>> > {
>>> > return X(); //error or what?? because constructor never returns
>>> > anything so what this return statement will receive after executing x()
>>> and
>>> > what it will return??
>>> > }
>>> >
>>> >
>>> > };
>>> >
>>> > --
>>> > You received this message because you are subscribed to the Google
>>> Groups
>>> > "Algorithm Geeks" group.
>>> > To post to this group, send email to [email protected].
>>> > To unsubscribe from this group, send email to
>>> > [email protected].
>>> > For more options, visit this group at
>>> > http://groups.google.com/group/algogeeks?hl=en.
>>> >
>>> >
>>>
>>>
>>> --
>>> Sanju
>>> :)
>>>
>>> --
>>> You received this message because you are subscribed to the Google Groups
>>> "Algorithm Geeks" group.
>>> To post to this group, send email to [email protected].
>>> To unsubscribe from this group, send email to
>>> [email protected].
>>> For more options, visit this group at
>>> http://groups.google.com/group/algogeeks?hl=en.
>>>
>>>
>>
>>
>> --
>> With regards
>> ............
>> Puneet Chawla
>> Computer Engineering Student
>> NIT Kurukshetra
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "Algorithm Geeks" group.
>> To post to this group, send email to [email protected].
>> To unsubscribe from this group, send email to
>> [email protected].
>> For more options, visit this group at
>> http://groups.google.com/group/algogeeks?hl=en.
>>
>
>
--
You received this message because you are subscribed to the Google Groups
"Algorithm Geeks" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/algogeeks?hl=en.
