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From: chris_tebbe AT yahoo DOT com (Chris)
Newsgroups: comp.os.msdos.djgpp
Subject: Recompiling old programs --> problems with fstream class
Date: 30 Mar 2004 05:31:42 -0800
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I cannot figure out why my old program no longer compiles under the
current release of DJGPP (it worked with a REALLY old version).  As
you can see,
FSTREAM is include, but it says IFSTREAM is not declared in this
scope?!  I
do not understand this error.  Any help is greatly appreciated!

Code snippet from header file "matrix.h"

#include <fstream>
#include <string>
#include <iomanip>
#include <malloc.h>
#include <conio.h>
#include <time.h>
#include <stdlib.h>
#include "border.h"

#ifndef Width
#define Width 8
#endif

#ifndef Precision
#define Precision 4
#endif

#ifndef FieldFlags
#define FieldFlags ios::fixed, ios::floatfield
#endif

class Matrix {
  private:
    char name[20];                              // matrix name
    int  rows;                                  // matrix rows
    int  columns;                               // matrix columns
    FLOAT_TYPE* elem;                           // pointer to matrix
data
  public:
    // Constructors
    Matrix();                                   // default constructor
    Matrix(float&);                             // conversion
constructor
    Matrix(Matrix&);                            // copy constructor
    Matrix(char*);                              // name-only
constructor
    Matrix(int, int=0);                         // size-only
constructor
    Matrix(char*, int, int=0);                  // name & size
constructor
    // Destructor
    ~Matrix();                                  // destructor
    // Member Functions
    void SetName(char*);                        // set matrix name
    void GetName(char*);                        // get matrix name
    void SizeOf(void);                          // display size of
matrix
    int NRows(void);                            // returns # of rows
    int NCols(void);                            // returns # of
columns
    void ReDim(int=0, int=0);                   // set matrix
dimensions
    void ReDim(Matrix&);                        // set matrix
dimensions
    void Randomize(int=1,int=0);                // randomize a matrix
    void Identity(int, int=0);                  // make Identity
Matrix
    void Identity(Matrix&);                     // make Identity
Matrix
    int Diag(Matrix&);                          // diagonalize a
matrix
    void KeyLoad(void);                         // load Matrix from
Keyboard
    int LoadAscii(ifstream&);                   // load Matrix from
Ascii File
    int SaveAscii(ofstream&);                   // save Matrix to
Ascii File
    int Load(ifstream&);                        // load Matrix from
Matlab File
    int Save(ofstream&);                        // save Matrix to
Matlab File
    void ErrorHandler(int);                     // matrix error
handler
    FLOAT_TYPE Max(void);                       // get max element
    FLOAT_TYPE Min(void);                       // get min element
    // Overloaded Operators
    FLOAT_TYPE& operator()(int, int);           // overloaded ()
operator
    Matrix& operator()(int,int,int,int);        // get a submatrix
    Matrix& operator+(Matrix&);                 // add matrices
    Matrix& operator-();                        // negate matrix
    Matrix& operator-(Matrix&);                 // subtract matrices
    Matrix& operator*(Matrix&);                 // multiply matrices
    Matrix& operator=(Matrix&);                 // overloaded =
operator
    Matrix& operator*=(Matrix&);                // element by element
mult
    Matrix& operator!();                        // invert matrix
    Matrix& operator~();                        // transpose matrix
    Matrix& operator||(Matrix&);                // column augment 2
matrices
    Matrix& operator&&(Matrix&);                // row augment 2
matrices
    int operator==(Matrix&);                    // compare 2 matrices
    operator FLOAT_TYPE();                      // Matrix ->
FLOAT_TYPE
    Matrix& operator=(FLOAT_TYPE&);             // FLOAT_TYPE ->
Matrix
    friend Matrix& operator+(Matrix&, FLOAT_TYPE);  // add matrix &
scalar
    friend Matrix& operator+(FLOAT_TYPE, Matrix&);  // add scalar &
matrix
    friend Matrix& operator-(Matrix&, FLOAT_TYPE);  // subtract scalar
from matrix
    friend Matrix& operator-(FLOAT_TYPE, Matrix&);  // subtract matrix
from scalar
    friend Matrix& operator*(Matrix&, FLOAT_TYPE);  // multiply matrix
& scalar
    friend Matrix& operator*(FLOAT_TYPE, Matrix&);  // multiply scalar
& matrix
    friend ostream& operator<<(ostream&,Matrix&);   // overloaded <<
operator
};


Error:

In file included from matrix.cc:7:
matrix.h:63: error: `ifstream' was not declared in this scope
matrix.h:63: error: parse error before `)' token
matrix.h:64: error: `ofstream' was not declared in this scope
matrix.h:64: error: parse error before `)' token
matrix.h:65: error: `ifstream' was not declared in this scope
matrix.h:65: error: parse error before `)' token
matrix.h:66: error: `ofstream' was not declared in this scope
matrix.h:66: error: parse error before `)' token
matrix.h:92: error: ISO C++ forbids declaration of `ostream' with no
type
matrix.h:92: error: `ostream' is neither function nor member function;
cannot
   be declared friend
matrix.h:92: error: parse error before `&' token