g++ compilation error

[deltatux]

Hey guys,

I'm quite confused here. My program works perfectly when compiled on Visual Studio 2008 but it doesn't compile on G++.

I don't even understand the error. I know that the ifstream is part of the C++ standard library so it makes even less sense:

Quote:

isbnprefix.cpp: In function 'int registered(FILE*, int)':
isbnprefix.cpp:32: error: no matching function for call to 'std::basic_ifstream<char, std::char_traits<char> >::basic_ifstream(FILE*&)'
/usr/include/c++/4.1.2/fstream:442: note: candidates are: std::basic_ifstream<_CharT, _Traits>::basic_ifstream(const char*, std::_Ios_Openmode) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.1.2/fstream:428: note: std::basic_ifstream<_CharT, _Traits>::basic_ifstream() [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.1.2/iosfwd:89: note: std::basic_ifstream<char, std::char_traits<char> >::basic_ifstream(const std::basic_ifstream<char, std::char_traits<char> >&)
isbnprefix.cpp: In function 'int minNoDigits(FILE*, int)':
isbnprefix.cpp:42: error: no matching function for call to 'std::basic_ifstream<char, std::char_traits<char> >::basic_ifstream(FILE*&)'
/usr/include/c++/4.1.2/fstream:442: note: candidates are: std::basic_ifstream<_CharT, _Traits>::basic_ifstream(const char*, std::_Ios_Openmode) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.1.2/fstream:428: note: std::basic_ifstream<_CharT, _Traits>::basic_ifstream() [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.1.2/iosfwd:89: note: std::basic_ifstream<char, std::char_traits<char> >::basic_ifstream(const std::basic_ifstream<char, std::char_traits<char> >&)
isbnprefix.cpp: In function 'int registered(FILE*, int, int)':
isbnprefix.cpp:65: error: no matching function for call to 'std::basic_ifstream<char, std::char_traits<char> >::basic_ifstream(FILE*&)'
/usr/include/c++/4.1.2/fstream:442: note: candidates are: std::basic_ifstream<_CharT, _Traits>::basic_ifstream(const char*, std::_Ios_Openmode) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.1.2/fstream:428: note: std::basic_ifstream<_CharT, _Traits>::basic_ifstream() [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.1.2/iosfwd:89: note: std::basic_ifstream<char, std::char_traits<char> >::basic_ifstream(const std::basic_ifstream<char, std::char_traits<char> >&)

My isbnprefix.cpp as follows:

code:

/*  isbnprefix.cpp  *  Assignment 1's ISBN prefix program file.  *  Copyright (C) 2009 Adrien Kwok.  *  *  This program is free software: you can redistribute it and/or modify  *  it under the terms of the GNU General Public License Version 3  *  as published by the Free Software Foundation.  *  *  This program is distributed in the hope that it will be useful,  *  but WITHOUT ANY WARRANTY; without even the implied warranty of  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the  *  GNU General Public License for more details.  *  *  You should have received a copy of the GNU General Public License  *  along with this program.  If not, see <[LINK REMOVED]>.  *  */ #include "stdheader.h" #include "prefix.h" void seekStart(FILE* fp) {         fseek(fp, 0, SEEK_SET); } FILE* open(const char* filename){         FILE* fp = new FILE;         fp = fopen (filename, "r");         return fp; } int registered(FILE* fp, int area){         seekStart(fp);         ifstream in(fp);         while (!in.eof()) {                 int area0, minPublisher, maxPublisher;                 in >> area0 >> minPublisher >> maxPublisher;                 if (area0 == area) return true;         }         return false; } int minNoDigits(FILE* fp, int area){         seekStart(fp);         ifstream in(fp);         while (!in.eof()) {                 // read one line                 int area0, minPublisher, maxPublisher;                 in >> area0 >> minPublisher >> maxPublisher;                 cout << maxPublisher;                 // determine the max number of digits                 if (area == area0) {                         if (maxPublisher <= 9) return 1;                         if (maxPublisher <= 99) return 2;                         if (maxPublisher <= 999) return 3;                         if (maxPublisher <= 9999) return 4;                         if (maxPublisher <= 99999) return 5;                         if (maxPublisher <= 999999) return 6;                         return 7;                 }                }                 return 0; } int registered(FILE* fp, int area, int publisher){         seekStart(fp);         ifstream in(fp);         while (in) {                 int area0, minPublisher, maxPublisher;                 in >> area0 >> minPublisher >> maxPublisher;                 if (area0 == area) {                         if (minPublisher <= publisher && publisher <= maxPublisher) return true;                 }         }         return false; } int close (FILE* fp){         int err = fclose(fp);         return err == 0 ? true : false; }

Thanks,
deltatux

[DemonWasp]

The error message is telling you that it can't find any function that can fulfill your call:

code:

ifstream in(fp);

This is because that's not a valid constructor. See documentation on ifstream here: http://www.cplusplus.com/reference/iostream/ifstream/ , specifically its constructor (see http://www.cplusplus.com/reference/iostream/ifstream/ifstream.html ).

You're really mixing C and C++ here. FILE is C, ifstream is C++. Visual Studio's implementation may be non-standard, which is why you had the other constructor there in VS.

[saltpro15]

... I was going to say you need the #include <fstream> but demonwasp's answer makes a lot more sense

[wtd]

You are not going to make any substantial headway until you ditch the C/C++ bastardization.