Error with Function object..

[Senthilvel Samatharman]

Hi,
I'm trying to learn a few Algorithms and function objects
But when i try the following program i get an error which i could not
understand.
Can you please help...

Regards,
Senthil.


#include <iostream>
#include <functional>
#include <vector>

using namespace std;

template <class T> class Print
{
public:
ostream outStream;
public:
Print(ostream ostr):outStream (ostr) { }
void operator ( ) (const T& val)
{
outStream<<val< <endl;
}
};

int main()
{
vector<int> arr;
arr.push_back(1 );
arr.push_back(2 );
arr.push_back(3 );
arr.push_back(4 );
arr.push_back(5 );
arr.push_back(6 );
arr.push_back(7 );

for_each(arr.be gin(),arr.end() ,Print<int>(cou t)); // << Error occurs
here

return 0;
}

But while compiling i get an error

for_each.cpp: In method `ostream::ostre am(const ostream &)':
/ap/gcc/gcc-bala/gcc-2.95.3/lib/gcc-lib/sparc-sun-solaris2.6/2.95.3/../../../../include/g++-3/streambuf.h:128 :
`ios::ios(const ios &)' is private
for_each.cpp:30 : within this context
for_each.cpp: In function `int main()':
for_each.cpp:30 : implicit declaration of function `int for_each(...)'
for_each.cpp:30 : warning: cannot pass objects of type `Print<int>'
through `...'

[Gianni Mariani]

Re: Error with Function object..

Senthilvel Samatharman wrote:[color=blue]
> Hi,
> I'm trying to learn a few Algorithms and function objects
> But when i try the following program i get an error which i could not
> understand.
> Can you please help...
>
> Regards,
> Senthil.[/color]

..... sample code removed
[color=blue]
> But while compiling i get an error
>
> for_each.cpp: In method `ostream::ostre am(const ostream &)':
> /ap/gcc/gcc-bala/gcc-2.95.3/lib/gcc-lib/sparc-sun-solaris2.6/2.95.3/../../../../include/g++-3/streambuf.h:128 :
> `ios::ios(const ios &)' is private
> for_each.cpp:30 : within this context
> for_each.cpp: In function `int main()':
> for_each.cpp:30 : implicit declaration of function `int for_each(...)'
> for_each.cpp:30 : warning: cannot pass objects of type `Print<int>'
> through `...'
>[/color]

Here is better formatting ...

#include <iostream>
#include <functional>
#include <vector>

using namespace std;

template <class T>
class Print
{
public:
ostream & outStream;
^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^ ^^^^^^^^
You can't copy outStream so we make it a reference

public:
Print(ostream & ostr):outStream (ostr) { }
^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^ ^^^^^^^^
Similarly here.


void operator ( ) (const T& val)
{
outStream<<val< <endl;
}
};

int main()
{
vector<int> arr;
arr.push_back(1 );
arr.push_back(2 );
arr.push_back(3 );
arr.push_back(4 );
arr.push_back(5 );
arr.push_back(6 );
arr.push_back(7 );

for_each(arr.be gin(),arr.end() ,Print<int>(cou t));
return 0;
}


This compled and ran with gcc 3.3.1

[Noah Roberts]

Re: Error with Function object..

Senthilvel Samatharman wrote:[color=blue]
> Hi,
> I'm trying to learn a few Algorithms and function objects
> But when i try the following program i get an error which i could not
> understand.
> Can you please help...
>
> Regards,
> Senthil.
>
>
> #include <iostream>
> #include <functional>
> #include <vector>
>
> using namespace std;
>
> template <class T> class Print
> {
> public:
> ostream outStream;
> public:
> Print(ostream ostr):outStream (ostr) { }
> void operator ( ) (const T& val)
> {
> outStream<<val< <endl;
> }
> };
>
> int main()
> {
> vector<int> arr;
> arr.push_back(1 );
> arr.push_back(2 );
> arr.push_back(3 );
> arr.push_back(4 );
> arr.push_back(5 );
> arr.push_back(6 );
> arr.push_back(7 );
>
> for_each(arr.be gin(),arr.end() ,Print<int>(cou t)); // << Error occurs
> here
>
> return 0;
> }
>
> But while compiling i get an error
>
> for_each.cpp: In method `ostream::ostre am(const ostream &)':
> /ap/gcc/gcc-bala/gcc-2.95.3/lib/gcc-lib/sparc-sun-solaris2.6/2.95.3/../../../../include/g++-3/streambuf.h:128 :
> `ios::ios(const ios &)' is private
> for_each.cpp:30 : within this context
> for_each.cpp: In function `int main()':
> for_each.cpp:30 : implicit declaration of function `int for_each(...)'[/color]

for_each is declared in <algorithm> I believe.
[color=blue]
> for_each.cpp:30 : warning: cannot pass objects of type `Print<int>'
> through `...'
>[/color]

[Dave Theese]

Re: Error with Function object..

For one thing, you need to #include <algorithm> for for_each() unless it's
somehow getting indirectly included. Not sure if this will fix everything,
but it's a good place to start!

"Senthilvel Samatharman" <Samatharman.Se nthilvel@adcc.a lcatel.be> wrote in
message news:3F5A085B.E E105D7F@adcc.al catel.be...[color=blue]
> Hi,
> I'm trying to learn a few Algorithms and function objects
> But when i try the following program i get an error which i could not
> understand.
> Can you please help...
>
> Regards,
> Senthil.
>
>
> #include <iostream>
> #include <functional>
> #include <vector>
>
> using namespace std;
>
> template <class T> class Print
> {
> public:
> ostream outStream;
> public:
> Print(ostream ostr):outStream (ostr) { }
> void operator ( ) (const T& val)
> {
> outStream<<val< <endl;
> }
> };
>
> int main()
> {
> vector<int> arr;
> arr.push_back(1 );
> arr.push_back(2 );
> arr.push_back(3 );
> arr.push_back(4 );
> arr.push_back(5 );
> arr.push_back(6 );
> arr.push_back(7 );
>
> for_each(arr.be gin(),arr.end() ,Print<int>(cou t)); // << Error occurs
> here
>
> return 0;
> }
>
> But while compiling i get an error
>
> for_each.cpp: In method `ostream::ostre am(const ostream &)':
>[/color]
/ap/gcc/gcc-bala/gcc-2.95.3/lib/gcc-lib/sparc-sun-solaris2.6/2.95.3/../../..
/../include/g++-3/streambuf.h:128 :[color=blue]
> `ios::ios(const ios &)' is private
> for_each.cpp:30 : within this context
> for_each.cpp: In function `int main()':
> for_each.cpp:30 : implicit declaration of function `int for_each(...)'
> for_each.cpp:30 : warning: cannot pass objects of type `Print<int>'
> through `...'
>[/color]

[Kevin Goodsell]

Re: Error with Function object..

Dave Theese wrote:
[color=blue]
> For one thing[/color]
<snip>

Please don't top-post. Re-read section 5 of the FAQ for posting
guidelines. You could also find this rule in pretty much any netiquette
reference, including RFC 1855.

http://www.parashift.com/c++-faq-lite/

-Kevin
--
My email address is valid, but changes periodically.
To contact me please use the address from a recent posting.