Re: newbie iterator question...

Hi,

I have this book "Objected-oriented programming in C++", 4.th edition by
Robert Lafore... It says on the back of this book that he has written
books about programming since 1982... Yeah, right... I did that too.

The whole chapter 15 about STL is completely full of errors. I get a lot
of compiler errors/warnings when I work with iterators... I just tried 4
examples from his chapter 15 about the STL...

I also have this "accelerated c++" but now I want to know why this
doesn't work:

// initer.cpp
// demonstrates istream_iterator
#include <iostream>
#include <list>
#include <algorithm>
using namespace std;

int main()
   {
   list<float> fList(5); // uninitialized list

   cout << "\nEnter 5 floating-point numbers: ";
                                   // istream iterators
   istream_iterator<float> cin_iter(cin); // cin //<- ERROR
   istream_iterator<float> end_of_stream; // eos //<- ERROR
                                   // copy from cin to fList
   copy( cin_iter, end_of_stream, fList.begin() ); //<- ERROR

   cout << endl; // display fList
   ostream_iterator<float> ositer(cout, "--"); //<- ERROR
   copy(fList.begin(), fList.end(), ositer); //<- ERROR
   cout << endl;
   return 0;
   }

5 lines with errors:

mac$ g++ initer.cpp
initer.cpp: In function 'int main()':
initer.cpp:14: error: 'istream_iterator' was not declared in this scope
initer.cpp:14: error: expected primary-expression before 'float'
initer.cpp:14: error: expected `;' before 'float'
initer.cpp:15: error: expected primary-expression before 'float'
initer.cpp:15: error: expected `;' before 'float'
initer.cpp:17: error: 'cin_iter' was not declared in this scope
initer.cpp:17: error: 'end_of_stream' was not declared in this scope
initer.cpp:20: error: 'ostream_iterator' was not declared in this scope
initer.cpp:20: error: expected primary-expression before 'float'
initer.cpp:20: error: expected `;' before 'float'
initer.cpp:21: error: 'ositer' was not declared in this scope

Compiler is g++. I haven't used iterators before but if I just knew how
to deal with this, I could probably correct the other wrong example code
that also deals with iterators, in the rest of chapter 15 in this lousy
book.

Best regards / Med venlig hilsen
Martin JHrgensen