I need help. please

This is a discussion on I need help. please within the C++ Programming forums, part of the General Programming Boards category; Hi ! I try to save a shapes from a vector to a file. When I compile a code I ...

  1. #1
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    I need help. please

    Hi !

    I try to save a shapes from a vector to a file. When I compile a code I get a very large error that begin:
    "C:/Qt2009_02/mingw/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stream_iterator.h: In member fu
    nction `std:stream_iterator<_Tp, _CharT, _Traits>& std:stream_iterator<_Tp, _CharT, _Traits>:perator=(const _Tp&) [wi
    th _Tp = const ShapePtr, _CharT = char, _Traits = std::char_traits<char>]':" ...

    Here is Main (NewShapes.cpp):
    Code:
    #include <vector>
    #include <fstream>
    #include <iterator>
    #include <string>
    #include "Vertex.h"
    #include "ShapePtr.cpp"
    using namespace std;
    
    main() {
      vector<ShapePtr> shapevec;
      Vertex varr[] = { Vertex(0,0), Vertex(10,0), Vertex(5,2), Vertex(5,5) };
      shapevec.push_back( ShapePtr(new Polygon(1, 4, varr, 4)) );
      shapevec.push_back( ShapePtr(new Circle(5, 5, 4)) );
      shapevec.push_back( ShapePtr(new Rectangle(4, 10, 2, 4)) );
      shapevec.push_back( ShapePtr(new Point(6, 7, 1)) );
    
      ofstream os("fil.dat");
      ostream_iterator<const ShapePtr> shapeout(os, "\n");
      copy(shapevec.begin(), shapevec.end(), shapeout);
      os.close();
    }
    What I'm missing, I wander.
    Thank You in advance.

    Adalte.

    Pd: I attached the files with code (NewShapes.cpp, ShapePtr.h, ShapePtr.cpp, Vertex.h) and full error message.
    Attached Files Attached Files

  2. #2
    C++まいる!Cをこわせ! Elysia's Avatar
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    22,449
    First of all, fix these things.
    When people point out problems, you fix them instead of ignoring them.

    Implicit main is invalid in C++.
    main() {
    should be
    int main() {

    And secondly, do not include .cpp files.

    As for the error, it seems to be related to the copy-line. I would suspect that the ostream_iterator for your file doesn't support the necessary interface for std::copy.
    In other words, you cannot use it with std::copy.
    Last edited by Elysia; 07-12-2009 at 04:00 PM.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  3. #3
    and the hat of wrongness Salem's Avatar
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    Help, please
    You need to start coming up with better topic titles as well.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  4. #4
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    You know a simple googling of a file/vector tutorial might have helped you out a lot more.
    ★ Inferno provides Programming Tutorials in a variety of languages. Join our Programming Forums. ★

  5. #5
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    Join Date
    Jul 2009
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    6
    Yes, Elysia You are right:
    "it seems to be related to the copy-line." I tested it: I remarked it and didn't get errors.

    "I would suspect that the ostream_iterator for your file doesn't support the necessary interface for std::copy." The question is:

    What I can do to get the ostream_iterator for file to support the necessary interface for std::copy ?

    Main:
    Code:
    #include <vector>
    #include <fstream>
    #include <iterator>
    #include <algorithm>
    #include <string>
    #include "Vertex.h"
    #include "Shapes.h"
    using namespace std;
    
    int main() {
      vector<ShapePtr> shapevec;
      Vertex varr[] = { Vertex(0,0), Vertex(10,0), Vertex(5,2), Vertex(5,5) };
      shapevec.push_back( ShapePtr(new Polygon(1, 4, varr, 4)) );
      shapevec.push_back( ShapePtr(new Circle(5, 5, 4)) );
      shapevec.push_back( ShapePtr(new Rectangle(4, 10, 2, 4)) );
      shapevec.push_back( ShapePtr(new Point(6, 7, 1)) );
    
      ofstream os("fildat.txt");
      ostream_iterator<const ShapePtr> shapeout(os, "\n");
      copy(shapevec.begin(), shapevec.end(), shapeout);
      os.close();
      ...
    }
    Thank You in advanced.

    Adalte.
    Last edited by Adalte; 07-13-2009 at 05:50 PM.

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