Cannot pass a ifstream to a function

Started by
8 comments, last by emileej 19 years, 12 months ago
This is my function:
char ReadFormatted(ifstream ifs){
    //some ifs.read(); stuff

}
I am, as the include paths will show, using DevC++ and the standard compiler that comes with it. This is the compiler output:
C:/Programmer/Dev-Cpp/include/c++/bits/ios_base.h: In copy constructor 
   `std::basic_ios >::basic_ios(const 
   std::basic_ios >&)'':
C:/Programmer/Dev-Cpp/include/c++/bits/ios_base.h:421: `
   std::ios_base::ios_base(const std::ios_base&)'' is private
CPage.cpp:349: within this context

C:/Programmer/Dev-Cpp/include/c++/streambuf: In copy constructor 
   `std::basic_filebuf >::basic_filebuf(const 

   std::basic_filebuf >&)'':
C:/Programmer/Dev-Cpp/include/c++/streambuf:486: `std::basic_streambuf<_CharT, 
   _Traits>::basic_streambuf(const std::basic_streambuf<_CharT, _Traits>&) 
   [with _CharT = char, _Traits = std::char_traits]'' is private
CPage.cpp:349: within this context 
Is there no way to have a function read from an ifstream defined elsewhere? I am thinking that perhaps some part of the ifstream object can be used to refer to it, but I am not all that experienced with fstream.
Emil Johansen- SMMOG AI designerhttp://smmog.com
Advertisement
Pass ifstream (and all stream) objects by constant reference.

char ReadFormatted(const ifstream& ifs)
{
...
}
"Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery?" - Patrick Henry
Pass it by non-const reference.
Yea. Thanks. Ofcourse I need to be working with a reference. *bashes self on forehead*. Thanks fallen :D
Emil Johansen- SMMOG AI designerhttp://smmog.com
Hmm. Didnt get me very far :/
As soon as I use the ifstream - the compiler complains:

CReader.cpp: In function `int ReadInt(const std::ifstream&)'':CReader.cpp:10: passing `const std::ifstream'' as `this'' argument of `   std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT,    _Traits>::get(_CharT&) [with _CharT = char, _Traits =    std::char_traits]'' discards qualifiers 


I simply do this:
char r;ifs.get(r);
Emil Johansen- SMMOG AI designerhttp://smmog.com
Remove the const qualifier on the ifstream, you can''t call non-const functions on a const reference.
Right you are. Thanks.
Emil Johansen- SMMOG AI designerhttp://smmog.com
Yeah, that was my bad, I meant non-const reference (as fallenang3l pointed out). Had a momentary lapse =)
"Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery?" - Patrick Henry
Haha, I just made that same mistake on my program.
That''s great, but don''t necro.

This topic is closed to new replies.

Advertisement