Celebrate National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17


G++ and fstream

Posted on 1998-04-20
Medium Priority
Last Modified: 2013-12-14
The following is a code i had on AIX C Set++


#include <iostream.h>
#include <fstream.h>
void main(){
  //fstream fh;
  char a[16],b[16];
  ifstream fh;
  if (!fh){
    cout << "This is bad " << endl;
    while (!fh.eof()){
      cout << a << "   " << b << endl;

I t works fine in C Set++ , but when I port it to GNU G++ it bombs with the following bobo

test.C:13: no matching function for call to `ifstream::get (char[16], int, char[2])'
/usr/local/lib/g++-include/iostream.h:164: candidates are: istream::get()
/usr/local/lib/g++-include/iostream.h:138:                 istream::get(streambuf &, char)
/usr/local/lib/g++-include/iostream.h:128:                 istream::get(signed char *, int, char)
/usr/local/lib/g++-include/iostream.h:126:                 istream::get(signed char &)
/usr/local/lib/g++-include/iostream.h:122:                 istream::get(unsigned char &)
/usr/local/lib/g++-include/iostream.h:121:                 istream::get(char &)
/usr/local/lib/g++-include/iostream.h:120:                 istream::get(unsigned char *, int, char)
/usr/local/lib/g++-include/iostream.h:118:                 istream::get(char *, int, char)
test.C:14: no matching function for call to `ifstream::get (ifstream, int, char[2])'
/usr/local/lib/g++-include/iostream.h:164: candidates are: istream::get()
Question by:asmara
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 6
LVL 22

Expert Comment

ID: 1162390
Just a stab, try

LVL 22

Expert Comment

ID: 1162391
Note you shouldn't have to do that, the compiler should treat a and p as char * pointers, but it sounds like it is not.  I guess you get what you pay for.

Author Comment

ID: 1162392
get is defined in istream class in iostream.h
and fstream class inherits from iostream.h
class ifstream : public fstreambase, public istream {

by conventation I should be able to get methods in istream, as I was able to in C Set++.
My question is what is wrong with G++ and by the way I am using gcc 2.8.1 and
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

LVL 22

Expert Comment

ID: 1162393
I think you can use the get functions.  I beleive the problem is that the getline function is not converting the character array parameters (like char a[16]) to character pointers (like char *a).  Did you try the syntax change I proposed?
LVL 22

Accepted Solution

nietod earned 60 total points
ID: 1162394
Nope.  Now I see it. Try.

LVL 22

Expert Comment

ID: 1162395
The problem is that the function is defined in the G++ library to take a CHARACTER as the last argument.  In the library you were using before (as in the library I have) it is defined to take a STRING as the last argument.  
LVL 22

Expert Comment

ID: 1162396
Note that the two functions it suggests that are close matches are

/usr/local/lib/g++-include/iostream.h:120:                 istream::get(unsigned char *, int, char)
/usr/local/lib/g++-include/iostream.h:118:                 istream::get(char *, int, char)

See the last parameter is "char" not "char *".  I suspect that "char *" is the standard and that the library you are using is little out of date or a little off the standard.

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

When writing generic code, using template meta-programming techniques, it is sometimes useful to know if a type is convertible to another type. A good example of when this might be is if you are writing diagnostic instrumentation for code to generat…
Jaspersoft Studio is a plugin for Eclipse that lets you create reports from a datasource.  In this article, we'll go over creating a report from a default template and setting up a datasource that connects to your database.
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.

730 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question