Objects with ostream_iterator and copy()

This is a discussion on Objects with ostream_iterator and copy() within the C++ Programming forums, part of the General Programming Boards category; if I want to do this Code: std::copy(myobj.begin(),myobj.end(),std::ostream_iterator<myobjtype>(std::cout, "\n"); What method do I have to overload in myobjtype to get ...

  1. #1
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    Objects with ostream_iterator and copy()

    if I want to do this
    Code:
    std::copy(myobj.begin(),myobj.end(),std::ostream_iterator<myobjtype>(std::cout, "\n");
    What method do I have to overload in myobjtype to get this to work? Is it operator<<()?

    Code:
    ostream & operator<<(ostream &, myobjtype);
    Is that the right signature?

  2. #2
    C++まいる!Cをこわせ!
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    You need to implement a forward iterator concept for you class.
    And you need to implement << operator, yes.
    The signature should be
    std::ostream & operator << (std::ostream & lhs, const myobjtype & rhs);
    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
    The larch
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    Yes, you'll need to overload that operator. If the object is large, you'd rather pass it by const reference.
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

  4. #4
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    Thank you. Elysia, what else needs to be done than just implement operator<<()?

    Edit:
    I think I know what you mean now. myobj is a std::vector. I realize now that that makes my code example a little off.
    The actual sample is:
    Code:
        std::vector<move> * moves = get_legal_moves();
        std::copy(moves->begin(), moves->end,
                std::ostream_iterator<move>(std::cout, "\n"));
    Last edited by Nextstopearth; 10-24-2010 at 03:55 PM.

  5. #5
    C++まいる!Cをこわせ!
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    Forward iterator and operator << should be all.
    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.

  6. #6
    Registered User whiteflags's Avatar
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    >>Forward iterator
    vector::iterator should work... move is not a container class.

  7. #7
    C++まいる!Cをこわせ!
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    This new code certainly doesn't require an iterator concept. But this was not there when I made the original reply.
    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.

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