Isn't istream_iterator defined in standard namespace?

[akilguo]

i included itreator header and declared istream_iterator using using declaration like this:

#include<iterator>
#include<iostream>
...
using std::istream_iterator
using std::cin;
...
int main()
{
...
istream_iterator<string> is_it( cin );
...

While compiled, the compiler complaint istream_iterator isn't a member of std
After that, i searched the internet , found that successful codes using

using namespace std 

, then i followed that, like this

#include<iterator>
#include<iostream>
...
using namespace std;
int main()
{
...// The same...
...
}

but the problem remains.
I use Mingw, well, i don't know the version, cause when i downloaded it , i didn't notice, now i don't know how and where to find out...I doubt there is something wrong with my Mingw, it seems like it is lack of something, such as a header...Can you help me? Thanks !

[Albatross]

The error message could not possibly have remained unchanged, else you have an insane compiler.

Here, try compiling the example from here:
http://cplusplus.com/reference/std/iterator/istream_iterator/

And see what you get. If its the same error, get an new MinGW.

-Albatross

[Duthomhas]

If you are using Dev-C++ then your version of MinGW is outdated. You'll want to update your MinGW to the latest version. (Find where Dev-C++ put it, delete the directory, and install your new MinGW in the same place.)

Good luck!

[helios]

You can check your MinGW version by running g++ --version from C:\MinGW\bin (assuming MinGW is installed in C:\MinGW, obviously). If it's 3.x, upgrade to 4.x.

[akilguo]

Hi, guys, i am sorry for my slow response...
I tried the example from that link, surprisingly, it works fine. I think i'd better post my whole source file here, maybe you can help me find out.
The intention of this program is to use an ostream_iterator bound to the std::cout to write what is read from an istream_iterator bound to an ifstream object to standard output . It's really simple, right? Here is my code:

#include<iostream>
#include<fstream>
#include<string>
#include<stdexcept>
#include<iterator>
using namesapce std;
int main()
{
cout << "Please enter a file name which you want to copy: " << endl;
string name;
cin >> name;
ifstream input_file( name.c_str() );
istream_iterator<string> in_iter( input_file ) , eof ;
ostream_iterator<string> out_iter( cout, ' ' );
cout << "The contents of the output file are : " << endl;
while( in_iter != eof ) * out_iter ++ = * in_iter ++;
return 0;
}

Is there anything wrong?

[akilguo]

Anybody help? I am really stuck on this...

[Albatross]

You misspelled "namespace".

And on line 14, you have a type conversion error (char to char*, 2nd argument)
(Using " " will fix it)

Fix those and it should compile just fine.

-Albatross

[guestgulkan]

using namesapce std; //ERROR: misspelling of the word namespace

ostream_iterator<string> out_iter( cout, ' ' );//ERROR in second parameter - should not be a char
should be:
ostream_iterator<string> out_iter( cout, " " );//Ok - should be a char*

You might need to put in some sort of pause before return 0; command so you can see the output

[akilguo]

I don't think that is the problem. I fixed them, well, the problem remains. The complier complains

istream_iterator was not declared in this scope;
ostream_iterator was not declared in this scope;
...

As i have tried , when i copy the example codes from the given link page, it works fine, doesn't that mean my compiler is all right? But now , it doesn't compile my codes , why?
According to what you said, my codes are fine except these two errors, if that is the case, where is the problem? I recommend you copy and compile the codes and tell me the result.
I think that will find out whether my compiler is all right.

[akilguo]

Hey, i found the problem, well , it's really an embarrassment, i misspelled the "iterator" in the include statement. Sorry, guys, wasted you so much time, i would never make such mistakes again. Again, Thanks you very very much.