error passing ifstream. why?

[Giulio]

I've the following error in the sample code below.. I think it's caused from
the passing of istream.
what causes this problem?
how can I solve it?

thank you very much

Giulio
---------------------------------------
Compiler: Default compiler
Building Makefile: "G:\Makefile.wi n"
Executing make...
make.exe -f "G:\Makefile.wi n" all
g++.exe -c main.cpp -o
ain.o -I"C:/Dev-Cpp/include/c++" -I"C:/Dev-Cpp/include/c++/mingw32" -I"C:/
Dev-Cpp/include/c++/backward" -I"C:/Dev-Cpp/include"

C:/Dev-Cpp/include/c++/bits/ios_base.h: In copy constructor
`std::basic_ios <char, std::char_trait s<char> >::basic_ios(co nst
std::basic_ios< char, std::char_trait s<char> >&)':
C:/Dev-Cpp/include/c++/bits/ios_base.h:421: `std::ios_base: :ios_base(const
std::ios_base&) ' is private
main.cpp:12: within this context
C:/Dev-Cpp/include/c++/streambuf: In copy constructor
`std::basic_fil ebuf<char,
std::char_trait s<char> >::basic_filebu f(const std::basic_file buf<char,
std::char_trait s<char> >&)':
C:/Dev-Cpp/include/c++/streambuf:486: `std::basic_str eambuf<_CharT,
_Traits>::basic _streambuf(cons t std::basic_stre ambuf<_CharT, _Traits>&)
[with _CharT = char, _Traits = std::char_trait s<char>]' is private
main.cpp:12: within this context

make.exe: *** [main.o] Error 1

Execution terminated
--------------------------------------

the CODE
------------------------------------
#include <fstream>
#include <iostream>
#include <stdlib.h>
#include <string>
using namespace std;
int importFromCSV(i fstream is){
return 5;
}//end importFromCSV

main (int argc, char *argv[]){
ifstream is ("aaa");
int q = importFromCSV(i s);
cout << q;
system ("pause");
return 0;
}
-----------------------------

[Victor Bazarov]

"Giulio" <giulio.gL E V [e-mail]> wrote...

I've the following error in the sample code below.. I think it's caused from the passing of istream.
what causes this problem?
std::ifstream doesn't have a usable copy c-tor.
how can I solve it?

Never pass streams by value. Always use references.

Victor

[Jon Bell]

In article <EU************ ********@tornad o.fastwebnet.it >,
Giulio <giulio.gL E V [e-mail]> wrote:

I've the following error in the sample code below.. I think it's caused from
the passing of istream.
Yes. You can't pass istreams by value, because you can't copy them. Pass
them by reference instead.
int importFromCSV(i fstream is){

Change that to

int importFromCSV(i fstream& is){

--
Jon Bell <jt*******@pres by.edu> Presbyterian College
Dept. of Physics and Computer Science Clinton, South Carolina USA