Array of Objects <NEWBIE>

This is a discussion on Array of Objects <NEWBIE> within the C++ Programming forums, part of the General Programming Boards category; Just woundering if there is away to make an array of objects, yet at the same time use the constructors ...

  1. #1
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    Angry Array of Objects <NEWBIE>

    Just woundering if there is away to make an array of objects, yet at the same time use the constructors within' the class.

    //This is DOES NOT WORK. But it's what i want to do.
    stock s[2];
    s[0]("Toys R Us",50,2.99);
    s[1]("iCafe Canada",100, 6.99);

    I dont know if this is even possible.

    Any help would be appretiated.

    Ulysses

  2. #2
    geek SilentStrike's Avatar
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    It's not possible in standard C++ to pass arguments for arguments to the constructor of different objects in an array. I believe gcc has an extension, however which enables it, but it is still not legal C++. You can get the same result (with the price of calling two constructors for each object), like the following.

    Code:
    stock s[2]; // calls stock's default constructor twice
    s[0] = stock("Toys R Us",50,2.99); // construct and assign a new stock/
    s[1] = stock("iCafe Canada",100, 6.99);
    Prove you can code in C++ or C# at TopCoder, referrer rrenaud
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  3. #3
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    Nope, you can't. I just checked. You can, however, make an array of pointers. Something like this:
    Code:
    stock *s[2];
    s[0] = new stock("Toys R Us",50,2.99);
    s[1] = new stock("iCafe Canada",100,6.99);
    s[2] = new stock("Disney",150,8.99);
    
    cout << s[0]->GetStockName() << ": " << s[0]->GetStock() << endl;
    ...
    That works. Hope that helps!

    Brendan
    Draco dormiens nunquam titillandus

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    So make the default constructor do nothing...
    Code:
    ...
    stock() {}
    ...

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    Oh wait yes you can, I did something way wrong lol. Yes just do that. Lol sorry.

    Brendan
    Draco dormiens nunquam titillandus

  6. #6
    geek SilentStrike's Avatar
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    But then you get the responsibility of managing dynamic memory. I would just use a vector.

    Code:
    std::vector<stock> stocks;
    stocks.push_back(stock("arg1", arg2, etc));
    stocks.push_back(stock(...));
    Prove you can code in C++ or C# at TopCoder, referrer rrenaud
    Read my livejournal

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    Thanx

    Thanx everyone, i used SilentStrike example and it seems to work.

    My only issue now is, i have to pass that array to functions, and i'm going to assume that won't be to hard.

    But am i losing alot of resources, or is it a poor way to code, if i make an array vs, two seperate objects?

    originaly i had

    stock s1("Blah", 2,2.33);
    stock s2("Blah2", 5,55.55);

    But i thought it would be easier and more effencent to pass an array of objects to a FUNCTION rather then passing 2 objects. Is my logic wrong?

    Ulysses

  8. #8
    ¡Amo fútbol!
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    Harryp, you write past the end of the array in your code.

  9. #9
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    Originally posted by SilentStrike
    Code:
    std::vector<stock> stocks;
    stocks.push_back(stock("arg1", arg2, etc));
    stocks.push_back(stock(...));
    I didn't even think about doing that... good idea

  10. #10
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    Did I? Good Heavens!!! Well, just goes to show how stupid I can really be. As a general rule, I'm always trying to help, but take caution with the advice I give as I'm an idiot lol and it could very well have something wrong with it.

    Brendan
    Draco dormiens nunquam titillandus

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