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The CICA Windows Explosion!
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12
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FNAME2.CPP
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1995-02-23
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68 lines
// File from page 516 in "Thinking in C++" by Bruce Eckel
//////////////////////////////////////////////////
// From the compressed package ECKELT01.ZIP 2/21/95
// Copyright (c) Bruce Eckel, 1995
// Source code file from the book "Thinking in C++",
// Prentice Hall, 1995, ISBN: 0-13-917709-4
// All rights reserved EXCEPT as allowed by the following
// statements: You may freely use this file for your own
// work, including modifications and distribution in
// executable form only. You may copy and distribute this
// file, as long as it is only distributed in the complete
// (compressed) package with the other files from this
// book and you do not remove this copyright and notice.
// You may not distribute modified versions of the source
// code in this package. This package may be freely placed
// on bulletin boards, internet nodes, shareware disks and
// product vendor disks. You may not use this file in
// printed media without the express permission of the
// author. Bruce Eckel makes no
// representation about the suitability of this software
// for any purpose. It is provided "as is" without express
// or implied warranty of any kind. The entire risk as to
// the quality and performance of the software is with
// you. Should the software prove defective, you assume
// the cost of all necessary servicing, repair, or
// correction.
// If you think you've found an error, please
// email all modified files with loudly commented changes
// to: eckel@aol.com (please use the same
// address for non-code errors found in the book).
//////////////////////////////////////////////////
//: FNAME2.CPP -- Subtyping solves the problem
#include <fstream.h>
#include <strstrea.h>
#include "..\allege.h"
class fname2 : public ifstream {
enum { bsize = 100 };
char buf[bsize];
ostrstream Name;
int nameset;
public:
fname2() : Name(buf, bsize), nameset(0) {}
fname2(const char* filename)
: ifstream(filename), Name(buf, bsize) {
Name << filename << ends;
nameset = 1;
}
const char* name() const { return buf; }
void name(const char* newname) {
if(nameset) return; // Don't overwrite
Name << newname << ends;
nameset = 1;
}
};
main() {
fname2 file("fname2.cpp");
allegefile(file);
cout << "name: " << file.name() << endl;
const bsize = 100;
char buf[bsize];
file.getline(buf, bsize); // This works too!
file.seekg(-200, ios::end);
cout << file.rdbuf() << endl;
}