c++ - Possible reasons for tellg() failing? -

ifstream :: tellg () -13 for a fixed file is returning.

Actually, I've written a feature that analyzes some source code; I open all the files alphabetically, I start with "Apple CPP" and it works perfectly .. But when "conversion is .ptp", always on the same file, reading a line After successfully gives tellg (-13). / P>

The code in question is:

 for  (int i = 0; i   
  ATOF  is: 
  bool etf (if {mfile.tellg () <0) FATAL (format ("DEBUG - tellg ():% d")% mFile.tellg ()); If (mFile.tellg ()> = GetSize ()) return true; return false; }  

After successfully reading the first row of Conversion.cpp, it is always DEBUG - tellg (): -13 .

This is the complete TextIFile class (written by me, may be the error):

  class textfile {public: textfile (string) And path): mPath (path), mSize (0) {mFile.open (path.c_str (), std :: ios :: in); If (! MFile.is_open ()) FATAL (format ("% s can not open:% s")% path.c_str ()% strerror (errno)); } Get the string GetPath () const {return mPath; } Size_t GetSize () {if mSize returns (mSize); Const size_t current_position = mFile.tellg (); MFile.seekg (0, std :: ios :: end); MSize = mFile.tellg (); MFile.seekg (CURRENT_POSITION); Return mSize; } Bool etf () {if (mFile.tellg ()}  gt; ; = GetSize (); return true; details are false;} string readline () {string ret; gateline (mfile, write); checkErrors (); return rit;} string readwall () {string write (std :: istreambuf_iterator & Lt; char & gt; (mFile), std :: istreambuf_iterator & lt; char & gt; (); CheckErrors (); Return Rit;} Private: Zero Checker () (if (! MFile.good ) FATAL (format "An error occurred while performing an I / O operation at% s")% mPath;} Const String mPath; First Mfile; Size_t mSize;};  
  
 
 
   
 
   
  Em> Edit:  I found the reason: Line end conversion and both \ r \ n instead of both \ r \ n, I saved them with \ r \ n and it worked. Is not going to happen?   
 
 
 It is difficult to know what exactly is  Conversion.cpp . However, with the stream posts  & lt;  is not defined by the standard. Before you format it, you might want to consider the perfect integer type of a full artist; I do not know how to format  FATAL  and  format ()  or how the %  operator is overloaded. Stream positions do not need to map to an integer in an anticipated way, of course if the file does not open in binary mode. 
 
 You may want to consider an alternative implementation for  AtEof () . Say something: 
 
  bool etf () {return mFile.peek () == ifstream :: traits_type :: eof (); }