ok...may be i forgot , can you please tell me correct code for the copy
constructor..?
On Sun, Aug 21, 2011 at 1:31 PM, JAIDEV YADAV <jaid...@gmail.com> wrote:
> dude u haven't used copy constructor properly .. check it out again ... you
> are not copying actually ... thats it ...
>
> On Sun, Aug 21, 2011 at 12:53 PM, Abhishek Yadav <
> algowithabhis...@gmail.com> wrote:
>
>> 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 <
>> algowithabhis...@gmail.com> 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 <
>>> puneetchawla...@gmail.com> wrote:
>>>
>>>> It will show error
>>>>
>>>> On Sun, Aug 21, 2011 at 12:21 PM, Sanjay Rajpal <srn...@gmail.com>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 <algowithsac...@gmail.com> 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??
>>>>> > }
>>>>> >
>>>>> >
>>>>> > };
>>>>> >
>>>>> > --
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>>>>> >
>>>>> >
>>>>>
>>>>>
>>>>> --
>>>>> Sanju
>>>>> :)
>>>>>
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>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> With regards
>>>> ............
>>>> Puneet Chawla
>>>> Computer Engineering Student
>>>> NIT Kurukshetra
>>>>
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>>>>
>>>
>>>
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>>
>
>
>
> --
> JaiDev Yadav
> (National Yoga Champion)
> Computer Engg. Dept.
> National Institute of Technology
> Kurukshetra,Haryana
>
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