Difference Between List x; and List x(); , if 'List' is a Class?

[roopa]

I have declared a class with name List;
and in main() function, i have declared the List object as follows


class List
{
public:
List()
{
cout<<"In List Constuctor";
}
};


int main(int argc, char* argv[])
{
List x1;
List x2();
}

Could anybody let me know, What is the difference between "List x1;"
and "List x2();" ?

Thanks in advance.

 

[Sharad Kala]

I have declared a class with name List;
and in main() function, i have declared the List object as follows


class List
{
public:
List()
{
cout<<"In List Constuctor";
}
};


int main(int argc, char* argv[])
{
List x1;

This is an object of class List.

List x2();

This declares a function x2 which takes no parameters and returns a List
object. The rule in C++ is that whatsoever can be parsed as a function
declarartion is done so.

}

-Sharad

 

[Alex Vinokur]

I have declared a class with name List;
and in main() function, i have declared the List object as follows


class List
{
public:
List()
{
cout<<"In List Constuctor";
}
};


int main(int argc, char* argv[])
{
List x1;
List x2();
}

Could anybody let me know, What is the difference between "List x1;"
and "List x2();" ?

Thanks in advance.

See relevant discussion at
http://groups.google.com/[email protected]

 

[Mike Wahler]

Re: Difference Between List x; and List x(); , if 'List' is a Class?

For this issue it makes no difference what the type of 'List' is.

I have declared a class with name List;
and in main() function, i have declared the List object as follows


class List
{
public:
List()
{
cout<<"In List Constuctor";
}
};


int main(int argc, char* argv[])
{
List x1;
List x2();
}

Could anybody let me know, What is the difference between "List x1;"
and "List x2();" ?

List x1;
/* creates object of type 'List', named 'x1'. */

List x2();
/* Declares (but doesn't define) a function nameed 'x2',
that takes no arguments and returns a value of type 'List'. */

You should get a 'missing function' error at link time.

-Mike

 

[Stephen Howe]

You should get a 'missing function' error at link time.

No you won't.

Stephen Howe

 

[Andrey Tarasevich]

List x1;
/* creates object of type 'List', named 'x1'. */

List x2();
/* Declares (but doesn't define) a function nameed 'x2',
that takes no arguments and returns a value of type 'List'. */

You should get a 'missing function' error at link time.
...

Only if you actually try to call the function.

 

[Jerry Coffin]

(e-mail address removed) (roopa) wrote in message
[ ... ]

Could anybody let me know, What is the difference between "List x1;"
and "List x2();" ?

A better question would be: "is there any real similiarity between the
two", to which the answer would be a barely qualified "No."

"List x1;" defines a List object named x1. "List x2();" declares a
function named x2 that takes no parameters and returns a List.